Coolant Fill Necks

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A coolant fill neck—also called a radiator filler neck or coolant inlet—serves as the primary fill point for your cooling system. This collection includes replacement and upgrade necks designed to solve common problems: cracked or leaking OEM plastic necks, difficult fill angles, or the need for a custom neck in engine-swapped and race applications. Whether you’re restoring a factory radiator or building a custom aluminum setup, a quality fill neck ensures a secure cap seal and reliable coolant service.

Key considerations when selecting a neck:

Inlet diameter (e.g., 1.25 in, 1.5 in, 2 in) must match your radiator’s hose barb.
Material: many necks are machined from billet aluminum for strength and corrosion resistance; some use stainless steel.
Cap style: standard, high-pressure, or threaded designs with O-ring seals.
Orientation: straight, angled, or swivel housings to clear obstructions.
Installation: most necks weld or bolt in place; verify your radiator’s upper tank configuration.

Browse our selection to find the right coolant fill neck for your cooling system needs.

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Coolant Fill Necks

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