Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

Upgrade your engine bay's reliability and aesthetics with the WCFab fabricated aluminum coolant tank kit. The factory plastic reservoirs on L5P Duramax trucks are prone to yellowing and clouding over time. More critically, the OE sensors are non-replaceable; when the sensor fails, it triggers a false low-coolant warning that requires the replacement of the entire tank assembly. Wehrli Custom Fab solves this with a durable aluminum design featuring a high-quality, cost-effective float-type sensor that is easily serviceable for the life of the vehicle.

This kit mounts directly into the OEM location using provided hardware and includes a billet aluminum sight glass for quick fluid level checks. Each tank is finished in a durable Bengal Red powder coat and topped with a black anodized billet aluminum cap. Made in the USA, this kit is the definitive fix for common cooling system headaches.

• Manufacturer Part Number: WCF100433-BR
• Fabricated aluminum construction with Bengal Red powder coat finish
• Serviceable low coolant level sensor eliminates permanent sensor failure issues
• Integrated billet aluminum coolant level sight glass
• Includes black anodized billet aluminum cap and overflow hose
• Direct replacement for GM part numbers: 84257137, 84214124, 84138913, 84174037
• Made in the USA

Designed for high-performance 6.7L Cummins applications, this Wehrli Custom Fab #12 JIC male fitting provides a secure, leak-free solution for the coolant port located behind the water pump. This fitting is an essential upgrade for custom cooling setups requiring a reliable JIC interface.

Precision CNC machined from high-grade billet aluminum, the fitting features a thick flange and an integrated mounting bolt tab to ensure the connection remains stable under vibration and pressure. The press-fit design incorporates a high-temperature O-ring seal to withstand the extreme thermal cycles common in diesel environments, finished with black anodizing for long-term corrosion resistance.

• CNC machined billet aluminum construction
• #12 JIC male fitting for custom coolant plumbing
• High-temperature O-ring seal for reliable performance
• Integrated mounting bolt tab for secure retention
• Durable black anodized finish
• Made in the USA
• Manufacturer Part Number: WCF205-140

Fits 2013-2015 Ram 2500 and 3500 HD trucks (6.7L Cummins) equipped with factory dual radiators.

This Wehrli Custom Fab (WCFab) upper coolant pipe replaces the factory rubber hose and failure-prone plastic Y-connector, which is a notorious leak point in the 6.7L Cummins cooling system. Fabricated from durable aluminum and finished in a gloss black powder coat, this upgrade provides a permanent solution to OEM plastic component fatigue. This kit is designed specifically for use with the original equipment RAM dual-radiator setup; please note that aftermarket radiators with non-standard inlet locations may require modification for fitment.

Features and Specifications:

• Fabricated aluminum coolant pipe construction
• Durable gloss black powder coat finish
• Includes heavy-duty stainless steel T-bolt clamps
• Includes high-temperature silicone boots
• Direct replacement for MOPAR Part Numbers: 52014722AD, 52014722AB, 52014722AC
• Made in the USA
• Manufacturer Part Number: WCF100867-GB

Fits 2013-2015 Ram 2500 and 3500 Heavy Duty trucks equipped with the 6.7L Cummins diesel engine and factory dual radiator cooling systems.

The Wehrli Custom Fabrication (WCFab) Upper Coolant Pipe is a heavy-duty solution for a common failure point on late-model Cummins engines. The factory rubber hose and plastic Y-connector are notorious for developing coolant leaks and complete failure over time due to heat cycling. This kit replaces those components with a durable, fabricated aluminum pipe designed to bolt directly to trucks with the OEM dual radiator configuration.

Finished in a resilient Bengal Red powder coat, this pipe provides a custom look while offering superior pressure resistance. The kit includes high-quality silicone boots and stainless steel T-bolt clamps to ensure a leak-free seal under demanding conditions. Please note: this part is designed specifically for use with OEM RAM dual radiators; aftermarket radiators with non-standard inlet locations may require modification.

• Manufacturer Part Number: WCF100867-BR
• Direct replacement for MOPAR Part Numbers: 52014722AD, 52014722AB, 52014722AC
• Fabricated aluminum construction eliminates failure-prone plastic Y-pipe
• Durable Bengal Red powder coat finish
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps
• Made in the USA

Fits 2013-2015 Ram 2500 and 3500 HD trucks (6.7L Cummins) equipped with the factory dual radiator cooling system.

Eliminate a common failure point in your cooling system with the Wehrli Custom Fabrication (WCFab) aluminum upper coolant pipe. This kit replaces the OEM rubber upper radiator hose and its failure-prone plastic Y-connector, which is known for developing hairline cracks and leaks over time. Engineered specifically for trucks with the dual radiator configuration, this fabricated aluminum pipe provides a more robust and reliable connection between the radiators and the engine.

• Fabricated aluminum coolant pipe with integrated Y-connector
• Durable Bengal Blue powder coat finish for corrosion resistance
• High-quality silicone boots for a secure, flexible seal
• Heavy-duty stainless steel T-bolt clamps included
• Direct replacement for MOPAR part numbers 52014722AD, 52014722AB, and 52014722AC
• Made in the USA
• Manufacturer Part Number: WCF100867-BB

Note: This component is designed for use with OEM RAM dual radiators. Fitment with aftermarket radiators is not guaranteed if the inlet locations deviate from the factory design.

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

The Wehrli Custom Fabrication Aluminum Upper Coolant Pipe is a heavy-duty upgrade designed to replace the failure-prone factory rubber upper radiator hose. This aluminum pipe offers increased durability and a custom aesthetic for your engine bay, finished in a signature WCFab Red powder coat. It is a direct-fit replacement for GM Part Number 84094878, providing a more secure connection that resists expansion and degradation under heat and pressure.

• Replaces OEM GM Part Number: 84094878
• High-quality aluminum coolant pipe construction
• Durable custom WCFab Red powder coat finish
• Reinforced silicone boots for high-temperature performance
• Stainless steel T-bolt clamps for a leak-free seal
• Manufacturer Part Number: WCF100742-RED

Fits select 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models (6.6L L5P Duramax).

Upgrade your engine bay’s reliability and aesthetics with the Wehrli Custom Fabrication (WCFab) Aluminum Upper Coolant Pipe. This kit is designed to replace the factory rubber upper coolant hose, which is prone to fatigue and failure over time. Constructed from high-quality aluminum tubing and finished in a durable Gloss White powder coat, this pipe provides a permanent solution that withstands the heat and pressure demands of the L5P Duramax engine.

This kit is a direct replacement for GM Part Number 84094878 and includes everything needed for a secure, leak-free installation, including reinforced silicone boots and heavy-duty stainless steel T-bolt clamps.

• Replaces factory rubber hose (GM Part No. 84094878)
• Mandrel-bent aluminum construction for improved durability
• Gloss White powder-coated finish for corrosion resistance
• Includes high-temperature silicone boots
• Includes stainless steel T-bolt clamps for a secure seal
• Manufacturer Part Number: WCF100742-GW

Designed for select GM vehicles, the Wehrli Custom Fabrication Billet Heater Core Fitting Kit (WCF100699) provides a robust solution to the common failure point of brittle, leak-prone plastic OEM heater core connectors.

This kit features a precision-machined billet aluminum quick-connect fitting that utilizes a wire retainer clip for secure, tool-free installation and removal. The internal serviceable O-ring seals ensure a leak-proof connection when installed with appropriate lubricant. Included is a preformed 1/2-inch universal heater hose assembly, engineered to maintain its shape and provide reliable coolant flow in demanding engine bay environments.

• Precision billet aluminum construction replaces fragile plastic factory fittings
• Preformed universal 1/2-inch heater hose assembly included
• Serviceable internal O-ring seals for long-term reliability
• Wire retainer clip allows for easy removal and installation without special tools
• Manufacturer Part Number: WCF100699

Fits 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD models (6.6L LML Duramax).

The Wehrli Custom Fabrication (WCFab) Aluminum Upper Coolant Pipe provides a durable, high-performance replacement for the factory rubber upper radiator hose. Designed to withstand the heat and pressure demands of the LML Duramax engine, this aluminum pipe eliminates the risk of hose expansion and failure. It features a custom two-stage powder coating in WCFab Red for long-lasting corrosion resistance and a clean engine bay appearance.

This kit is engineered for a direct fit with the OEM GM radiator. Please note that while it integrates seamlessly with factory cooling systems, some aftermarket radiators may cause fitment clearance issues.

• High-quality aluminum construction replaces prone-to-fail OEM rubber hoses
• Custom Two-Stage WCFab Red powder coated finish
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps
• Compatible with factory GM radiators
• Installation instructions included
• Manufacturer Part Number: WCF100696-RED

Fits select 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD models (6.6L LML Duramax).

Replace the failure-prone factory rubber upper radiator hose with this heavy-duty aluminum coolant pipe from Wehrli Custom Fabrication. Unlike the OEM rubber hose that can soften and collapse over time, this mandrel-bent aluminum pipe maintains its structural integrity under pressure and adds a custom aesthetic to your engine bay with a Gloss White powder-coated finish.

This kit is designed for a direct-fit installation on vehicles equipped with the OEM GM radiator. It includes high-quality silicone boots and heavy-duty T-bolt clamps to ensure a leak-free seal. Please note that some aftermarket radiators may cause fitment issues due to varying inlet/outlet positions.

• Replaces factory rubber upper coolant hose
• Mandrel-bent aluminum construction
• Custom Gloss White single-stage powder coating
• Includes silicone boots and T-bolt clamps
• Designed for use with OEM GM radiator
• Manufacturer Part Number: WCF100696-GW

Fits 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L LML Duramax).

The Wehrli Custom Fabrication aluminum upper coolant pipe is a heavy-duty replacement for the failure-prone factory rubber upper coolant hose on LML Duramax engines. Constructed from high-quality aluminum and finished in a gloss black single-stage powder coating, this pipe provides superior durability and a clean, professional look under the hood.

This kit is designed specifically for use with the factory OEM GM radiator. Please note that some aftermarket radiators may cause fitment issues due to differences in inlet positioning. The package includes all necessary components for a secure installation, featuring high-temperature silicone boots and heavy-duty T-bolt clamps to ensure leak-free performance under pressure.

• Manufacturer Part Number: WCF100696-GB
• Material: Mandrel-bent aluminum pipe
• Finish: Gloss Black powder coat
• Replaces OEM rubber upper coolant hose
• Includes silicone boots and T-bolt clamps
• For use with OEM GM radiator

Fits 2003-2009 Dodge Ram 2500 and 3500 (5.9L / 6.7L Cummins).

Upgrade your cooling system and eliminate the potential for failure associated with aging factory rubber hoses. This Wehrli Custom Fabrication (WCF) upper coolant pipe is constructed from durable aluminum and features a high-quality Bengal Red powder coat finish. It is designed to be a direct replacement for the OEM upper coolant hose, providing a more robust and visually appealing solution under the hood. This kit includes heavy-duty silicone boots and stainless steel T-bolt clamps to ensure a leak-free seal under pressure.

• Replaces failure-prone OEM rubber upper coolant hose
• Durable aluminum construction with Bengal Red powder coat finish
• Includes high-temperature silicone boots and T-bolt clamps
• Designed for use with OEM Ram radiators only (aftermarket radiators may cause fitment issues)
• NOT compatible with trucks equipped with twin CP3 pumps
• Manufacturer Part Number: WCF100678-BR
• Replaces MOPAR Part Numbers: 52028872AG, 52028872AC, 52028872AD, 52028872AE, 52028872AF, 55056665AA

Fits select 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD models (6.6L).

The Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit provides a durable and aesthetically superior alternative to the fragile, factory-installed plastic reservoir. Engineered as a direct bolt-on replacement, this kit mounts to the factory locations using OEM mounting points, requiring no modifications to your truck. The fabricated aluminum construction eliminates the risk of cracks and leaks common with aged plastic units while the sight glass allows for immediate fluid level verification.

This kit is finished in a durable WCFab Red powder coat and features a black anodized CNC-machined billet aluminum cap. For full functionality, WCFab includes a new low coolant level sensor and overflow hose, ensuring a complete, professional installation that integrates perfectly with your Duramax engine bay.

• Fabricated aluminum construction for maximum durability
• Durable WCFab Red powder coat finish
• Integrated coolant level sight glass
• Black anodized CNC-machined billet aluminum cap
• Includes low coolant level sensor and overflow hose
• Installs in factory location with basic hand tools
• Replaces GM part numbers: 22866587, 22769155, 22810003, 25869265, 22820166, 22957038, 23106015
• Manufacturer Part Number: WCF100647-RED

Fits select 2011-2016 Chevrolet Silverado and GMC Sierra 2500/3500 HD models (6.6L LML Duramax).

Replace the factory clear plastic coolant reservoir that is prone to yellowing and cracking with this Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit. Built from durable fabricated aluminum, this tank is a direct bolt-on upgrade that mounts to factory locations using basic hand tools. Finished in a high-gloss white powder coat, it provides a significant engine bay aesthetic upgrade while maintaining the utility of a built-in coolant level sight glass.

This comprehensive kit includes a black anodized CNC machined billet aluminum cap, a pre-installed low coolant level sensor, and all necessary hardware for a seamless installation on stock trucks. It is designed to be fully compatible with the 6.6L Duramax LML cooling system and requires no permanent modifications to the vehicle.

• Fabricated aluminum construction with Gloss White powder coat finish
• Integrated coolant level sight glass for easy fluid checks
• Black anodized billet aluminum cap and overflow hose included
• Pre-installed low coolant level sensor prevents dash warnings
• Direct replacement for GM part numbers: 22866587, 22769155, 22810003, 25869265, 22820166, 22957038, 23106015
• Manufacturer Part Number: WCF100647-GW

Fits 2011-2016 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD models equipped with the 6.6L LML Duramax diesel engine.

The Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit replaces the fragile, discolored factory plastic reservoir with a heavy-duty fabricated aluminum unit. Designed to bolt directly to the factory mounting points, this kit cleans up the engine bay while providing superior durability against the heat and pressure cycles of the cooling system. Each tank features a built-in sight glass for quick fluid level inspections and a custom powder-coated Gloss Black finish.

• Fabricated Aluminum Construction: TIG-welded for maximum strength and a precision fit.
• Complete Solution: Includes a black anodized CNC-machined billet aluminum cap, low coolant level sensor, and overflow hose.
• Installation: Direct bolt-on replacement; uses basic hand tools and factory mounting locations.
• Finish: Durable Gloss Black powder coat for a professional, long-lasting look.

• Manufacturer Part Number: WCF100647-GB
• Replaces OE GM Part Numbers: 22866587, 22769155, 22810003, 25869265, 22820166, 22957038, 23106015
• Included Hardware: Sight glass, low coolant sensor, billet cap, overflow hose, and mounting hardware

Fits 2013-2018 Ram 2500 and 3500 (6.7L Cummins) models.

Replace the failure-prone factory plastic reservoir with the Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit. This fabricated aluminum tank is designed to bolt directly into the factory mounting location using basic hand tools, offering a significant upgrade in both durability and engine bay aesthetics. Finished in a custom WCFab Red two-stage powder coat, this kit includes a CNC-machined black anodized billet aluminum cap and a built-in sight glass for quick coolant level checks.

Engineered for versatility, this tank is compatible with stock or drop-in turbochargers and is specially shaped to provide necessary clearance for larger aftermarket or compound turbocharger configurations. The kit includes a pre-installed low coolant sensor and all necessary mounting hardware for a seamless installation.

• Fabricated aluminum construction for superior durability
• Two-stage WCFab Red powder coat finish
• Black anodized CNC-machined billet aluminum cap
• Integrated coolant level sight glass
• Includes low coolant sensor and overflow hose
• Mounts to factory location with included hardware
• Manufacturer Part Number: WCF100628-RED

Fits 2013-2018 Ram 2500 and 3500 (6.7L Cummins).

Replace the factory plastic reservoir with the Wehrli Fabricated Aluminum Coolant Tank Kit. This heavy-duty upgrade eliminates the brittle clear plastic OE tank that is prone to cracking and discoloration over time. Engineered for direct OEM placement, this tank bolts to factory mounting points and is compatible with stock trucks, drop-in turbos, or larger aftermarket and compound turbocharger configurations.

Finished in a durable Gloss Black powder coat, this kit includes a high-quality sight glass for quick fluid level checks and a CNC-machined black anodized billet aluminum cap. The kit is designed for a straightforward installation using basic hand tools and includes all necessary mounting hardware, an overflow hose, and a new low coolant sensor to ensure seamless integration with your Ram's monitoring system.

• Direct replacement for plastic OEM coolant reservoir
• Durable fabricated aluminum construction
• Gloss Black single-stage powder coat finish
• Integrated sight glass for easy level monitoring
• Includes black anodized CNC machined billet aluminum cap
• Compatible with stock, drop-in, and compound turbo setups
• Includes low coolant sensor and overflow hose
• Uses factory mounting points for easy installation
• Manufacturer Part Number: WCF100628-GB

Fits 2013-2018 Ram 2500 and 3500 (6.7L Cummins) trucks across all trim levels including Laramie, Tradesman, and SLT.

Replace the factory clear plastic reservoir in your engine bay with this Wehrli Custom Fabrication (WCFab) OEM Placement Coolant Tank Kit. This fabricated aluminum tank is designed to bolt directly to the factory mounting points, providing a durable and aesthetically superior solution to the prone-to-fail OE plastic tank. Finished in a durable Candy Red two-stage powder coat, this kit is compatible with stock or drop-in turbochargers and provides necessary clearance for larger aftermarket or compound turbocharger configurations.

The kit features a built-in coolant level sight glass for easy maintenance checks and includes a premium black anodized CNC machined billet aluminum cap. Installation is straightforward using basic hand tools and original mounting locations.

• Manufacturer Part Number: WCF100628-CR
• Fabricated aluminum coolant tank construction
• Two-stage Candy Red powder coat finish
• Black anodized CNC machined billet aluminum cap
• Integrated coolant level sight glass
• Includes low coolant sensor and overflow hose
• Mounting hardware included
• Compatible with factory mounting points

Fits select 2013-2018 Ram 2500 and 3500 trucks (6.7L).

Replace the failure-prone or unsightly clear plastic factory reservoir with this Wehrli Custom Fabrication (WCFab) heavy-duty fabricated aluminum coolant tank. Engineered as a direct bolt-on replacement, this kit mounts to the factory OEM locations and is designed to provide additional clearance for larger aftermarket or compound turbocharger setups while remaining compatible with stock trucks.

The kit features a durable Bengal Red single-stage powder-coated finish and includes a CNC-machined black anodized billet aluminum cap. A built-in sight glass allows for quick visual fluid level checks, and the kit comes complete with a low coolant sensor and necessary hardware to ensure a seamless installation using basic hand tools.

• Fabricated aluminum construction with Bengal Red powder-coated finish
• Black anodized CNC-machined billet aluminum cap
• Integrated coolant level sight glass for easy monitoring
• Includes low coolant sensor, overflow hose, and mounting hardware
• Provides clearance for large single and compound turbo setups
• Direct fit for OEM mounting points; no modifications required
• Manufacturer Part Number: WCF100628-BR

Fits 2020-2025 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L L5P Duramax).

Upgrade your L5P Duramax engine bay with the Wehrli Custom Fabrication (WCFab) Upper Coolant Pipe. This kit replaces the factory rubber upper radiator hose with a premium, fabricated aluminum hard pipe, finished in a durable Gloss White powder coat. This hard pipe solution eliminates the expansion and potential failure points of the original equipment while significantly improving under-hood aesthetics.

• Direct replacement for GM Part Numbers: 84813629, 85122989
• Fabricated aluminum construction for maximum durability
• Gloss White powder coat finish for corrosion resistance and a custom look
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps for a secure, leak-free seal
• Bolt-on installation with basic hand tools; no modifications required for stock trucks
• Designed specifically for use with the OEM GM radiator

Note: This component is intended for use with factory radiators. Fitment cannot be guaranteed with aftermarket radiator units. Includes aluminum coolant pipe, silicone boots, and T-bolt hardware. Manufacturer Part Number: WCF100541-GW.

Fits 2013-2018 Ram 2500 and 3500 HD trucks (6.7L Cummins).

Upgrade your cooling system with the Wehrli Custom Fabrication (WCFab) Aluminum Upper Coolant Pipe. This high-performance component is designed to replace the factory rubber upper radiator inlet hose, which is prone to degradation and failure under high heat and pressure. Constructed from mandrel-bent aluminum and finished in a durable Gloss White powder coat, this pipe ensures a reliable connection while significantly enhancing your engine bay's appearance.

• MPN: WCF100517-GW
• Material: Mandrel-bent aluminum
• Finish: Gloss White powder coat
• Inclusions: Heavy-duty silicone boots and stainless steel T-bolt clamps
• Replaces: OEM rubber radiator inlet hose
• Radiator Compatibility: For use with OEM RAM radiators (aftermarket radiators may require modification if inlet locations vary)

Note: This part is not for use on 2013-2015 models equipped with dual radiators or twin CP3 pump configurations.

Replaces MOPAR Part Numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, 68227796AA.

Fits select 2013-2018 Ram 2500 and 3500 HD trucks (6.7L Cummins).

The Wehrli Custom Fabrication WCF100517-GB Upper Coolant Pipe replaces the factory rubber radiator inlet hose with a rigid, mandrel-bent aluminum alternative. Designed for 6.7L Cummins-equipped HD trucks, this upgrade eliminates the risk of hose failure or swelling under pressure while significantly enhancing the appearance of the engine bay with a durable gloss black powder-coated finish.

This component is engineered for use with the OEM RAM radiator. Please note that fitment is not verified for 2013-2015 models equipped with dual radiators or vehicles utilizing a twin CP3 pump configuration. This kit provides a clean, professional installation by utilizing high-quality silicone boots and stainless steel T-bolt clamps.

• Construction: Mandrel-bent aluminum tubing
• Finish: Durable Gloss Black powder coat
• Included Hardware: Heavy-duty silicone boots and T-bolt clamps
• Replaces MOPAR Part Numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, 68227796AA
• Manufacturer Part Number: WCF100517-GB

Fits 2013-2018 Ram 2500 and 3500 HD trucks equipped with the 6.7L Cummins diesel engine.

The Wehrli Custom Fabrication (WCF) Aluminum Upper Coolant Pipe provides a professional-grade upgrade over the failure-prone factory rubber radiator inlet hose. While OEM rubber hoses can soften, bulge, or degrade due to heat cycles and cooling system pressure, this mandrel-bent aluminum pipe offers a rigid, permanent solution. Finished in a premium Candy Red powder coat, it improves both the reliability and aesthetics of your 6.7L engine bay.

• Construction: Mandrel-bent aluminum tubing
• Finish: Durable Candy Red powder coat
• Hardware Included: High-temperature silicone boots and stainless steel T-bolt clamps
• Installation: Replaces the radiator inlet hose to factory mounting points
• Compatibility: Designed for use with OEM RAM radiators
• Manufacturer Part Number: WCF100517-CR

This pipe is a direct replacement for the following MOPAR part numbers: 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, and 68227796AA.

Fits 2013-2018 Ram 2500 and 3500 HD trucks equipped with the 6.7L Cummins engine. This kit is designed for models without dual radiators or twin CP3 pumps.

The Wehrli Custom Fab (WCFab) Upper Coolant Pipe replaces the factory-installed rubber upper radiator hose with a heavy-duty, rigid aluminum solution. This upgrade eliminates the risk of hose failure or expansion under high pressure and temperature, providing a more reliable connection to the radiator inlet. Each pipe is finished in a durable Bengal Red powder coat for long-lasting corrosion resistance and a custom under-hood appearance.

This pipe is designed specifically for use with the OEM Ram radiator; fitment with aftermarket radiators cannot be guaranteed if the inlet location deviates from factory dimensions.

• Material: High-grade aluminum piping
• Finish: Bengal Red powder coat
• Installation: Direct replacement for Mopar part numbers 68166469AC, 68166469AA, 68166469AB, 68224266AB, 68224266AA, 55056954AB, 55056954AA, 68227796AB, and 68227796AA
• Includes: Aluminum coolant pipe, heavy-duty silicone boots, and stainless steel T-bolt clamps
• MPN: WCF100517-BR

Fits select 2001-2024 Chevrolet and Dodge trucks equipped with WCFab fabricated coolant tanks (6.7L).

Upgrade your engine bay with the Wehrli Custom Fabrication (WCFab) Billet Aluminum Coolant Tank Cap. Engineered as a high-durability replacement for WCFab fabricated coolant tanks, this cap is CNC-machined from premium billet aluminum to withstand the heat and pressure of high-performance cooling systems. The clear anodized finish provides a clean, professional look while offering long-term protection against corrosion.

• Precision CNC-machined billet aluminum construction
• Clear anodized finish for corrosion resistance
• Pressure rated for 18-20 PSI systems
• Direct fit for WCFab fabricated coolant tanks
• Aesthetic match for WCFab oil and brake reservoir caps
• Manufacturer Part Number: WCF100472

Fits select 2014-2020 Chevrolet Silverado/GMC Sierra 1500, 2500HD, 3500HD, Tahoe, Suburban, Yukon, and Cadillac Escalade (4.3L / 5.3L / 6.2L / 6.6L Duramax). This WCFab Transmission Cooler Thermostat Bypass Plug is a high-performance direct replacement for the failure-prone OEM thermostat found in GM 6L80, 6L90, and 8L90 transmissions.

By eliminating the restrictive factory thermal valve, this bypass plug allows for immediate and maximum fluid flow to the transmission cooler. In testing, this modification has shown fluid temperature drops of 15-50°F, protecting your transmission from the dangerous heat soak often experienced during heavy towing or in warm climate conditions. The CNC-machined billet aluminum construction ensures a precise fit and long-term durability compared to the stock plastic or cast components.

• Direct replacement for OEM part number: WCF100469
• Reduces fluid flow restriction to the transmission cooler
• CNC machined billet aluminum construction with a black anodized finish
• Equipped with high-temperature silicone O-ring seals for a leak-free fit
• Quick and easy installation; easily reversible for cold weather operation
• Recommended for both stock and built transmissions

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500HD / 3500HD (6.6L L5P Duramax).

The factory plastic coolant reservoirs on the L5P Duramax are prone to yellowing and becoming cloudy over time, which detracts from your engine bay's appearance. More critically, the OE units feature integrated, non-replaceable level sensors that frequently fail, triggering persistent false "low coolant" warnings that require the replacement of the entire tank assembly. The WCFab Fabricated Aluminum Coolant Tank Kit addresses these issues with a durable, American-made solution designed to mount in the factory location.

Constructed from high-quality aluminum and finished in a Gloss White powder coat, this kit features a serviceable float-type low coolant level sensor and a billet aluminum sight glass for easy fluid monitoring. This design ensures that if the sensor ever fails, it can be replaced individually without discarding the entire tank. The kit comes complete with a black anodized billet aluminum cap and all necessary installation hardware.

• Fabricated aluminum construction for superior durability
• Billet aluminum coolant level sight glass
• Serviceable low coolant level sensor eliminates common OE failure point
• Gloss White powder coat finish
• Includes black anodized billet aluminum cap and overflow hose
• Direct replacement for GM Part Numbers: 84257137, 84214124, 84138913, 84174037
• Made in USA
• Manufacturer Part Number: WCF100433-GW

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD models (6.6L L5P Duramax).

The factory plastic coolant reservoirs on the L5P Duramax are prone to yellowing and clouding over time, making fluid levels difficult to read and detracting from the engine bay's appearance. More critically, the OE units feature non-replaceable sensors that often fail prematurely, triggering false low coolant warnings that require the replacement of the entire tank assembly. This Wehrli Custom Fabrication (WCFab) kit provides a permanent solution by mounting a durable, fabricated aluminum tank in the factory location.

This kit upgrades your cooling system with a high-quality float-type sensor that is fully serviceable, ensuring you never have to replace the whole tank due to a sensor malfunction again. Constructed in the USA and finished in a resilient gloss black powder coat, this kit includes a billet aluminum sight glass for quick level checks and a black anodized billet cap for a premium seal.

• Direct replacement for GM Part Numbers: 84257137, 84214124, 84138913, 84174037
• Fabricated aluminum construction with gloss black powder coat finish
• Integrated billet aluminum coolant level sight glass
• Serviceable low coolant level sensor eliminates common OE failure point
• Includes black anodized billet aluminum cap and overflow hose
• Complete with all necessary installation hardware
• Made in the USA
• Manufacturer Part Number: WCF100433-GB

Fits 2017-2019 Chevrolet Silverado and GMC Sierra 2500/3500 HD (6.6L).

The WCFab Fabricated Aluminum Coolant Tank Kit for the L5P Duramax provides a durable, professional-grade solution to the common issues found with factory plastic reservoirs. Over time, original equipment (OE) tanks are prone to yellowing and clouding, making it difficult to monitor fluid levels and detracting from the engine bay's appearance. More critically, the factory units feature non-replaceable sensors that often fail, triggering false low-coolant warnings and requiring the replacement of the entire reservoir assembly.

This Wehrli Custom Fabrication kit (MPN WCF100433-FB) mounts directly to the OEM location and utilizes a serviceable, high-quality float-type sensor for long-term reliability. Constructed from heavy-duty aluminum and finished in a flat black powder coat, the tank includes a billet aluminum sight glass for quick visual checks and a black anodized billet cap for a clean, finished look.

• Direct replacement for GM part numbers: 84257137, 84214124, 84138913, 84174037
• Fabricated aluminum coolant tank with flat black powder coat
• Billet aluminum coolant level sight glass for easy monitoring
• Serviceable low-coolant level sensor (float-type)
• Black anodized billet aluminum cap included
• Includes installation hardware and overflow hose
• Made in the USA

Fits select 2006-2010 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD (6.6L LBZ/LMM Duramax). This Wehrli Custom Fabrication (WCFab) Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit replaces the restrictive factory upper radiator hose and coolant return pipe. By rerouting the coolant upward and forward from the thermostat, this kit clears the driver-side valve cover area to improve access to fuel system components and provide necessary clearance for larger aftermarket turbochargers.

• CNC Machined Billet Aluminum Thermostat Upper Housing
• Improves clearance for valley-mounted S300/S400 SXE and race cover style turbochargers
• Compatible with factory VGT style turbochargers
• Replaces GM Part Numbers 19330105, 15792824, 25833204, and 97361881
• WCFab Red custom powder coat finish
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps
• Designed for single CP3 setups (MPN: WCF100420-RED)