Bungs

Weld-in bungs are the foundation for adding oxygen sensors, exhaust gas temperature probes, wideband controllers, or air/fuel ratio gauges to your exhaust system. This collection covers the bungs you need to properly mount sensors in headers, downpipes, test pipes, and cat-back systems—whether you're tuning, diagnosing, or building a custom exhaust.

Choosing the right bung comes down to thread size, material, and sensor type. Most common passenger-vehicle O2 sensors use an M18×1.5 thread; larger diesel or industrial applications may call for M12 or M14. The bung material should match your exhaust tubing—mild steel for aluminized steel, 304 stainless for stainless systems—to ensure clean welds and corrosion resistance. Some bungs include a tapered seat for sensor sealing, while others use a flat gasket surface.

  • Common M18×1.5 thread for narrowband and most wideband sensors
  • Available in mild steel and 304 stainless steel
  • Straight and angled profiles to clear tight spaces
  • Bungs for standard narrowband, wideband, and EGT probes

For mild-steel exhausts, a zinc-plated bung keeps cost down and welds easily. When you're working with stainless tubing, a matching stainless bung prevents galvanic corrosion. If space around the sensor is tight, an angled bung can angle the sensor away from the firewall or transmission. No matter the project, starting with the correct bung saves rework and keeps your sensor sealing leak-free.

$
-
$
0 selected
0 selected
Apply (0)

$9.99

In stock
Vibrant Performance -10 AN female aluminum weld-on bung with internal 7/8-14 threads for custom tank fabrication.
$11.29 $15.29
-26%
In stock
Titanium O2 sensor bung featuring integrated heat sink cooling fins and M18x1.5 threads for exhaust mounting.

$24.99

Low in stock
Stainless Bros M18x1.5 O2 sensor bung plug with copper crush washer

$7.99

Low in stock
Stainless Bros 1/8 inch NPT stainless steel weld-on bung for automotive sensors.

$6.99

Low in stock
10-pack of Vibrant Performance M10 x 1.25 aluminum stand off weld bungs for custom fabrication.
$46.99 $62.99
-25%
Low in stock
Machined hex-shaped weld-in threaded bung with matching jam nut for 1-1/4 inch-12 right hand threads.

$41.00

In stock
Set of five Vibrant Performance T304 stainless steel M18 x 1.5 oxygen sensor weld bungs for exhaust fabrication.
$17.50 $23.50
-26%
In stock
CNC machined black Delrin frame tube plugs for the front chassis crossmember of a Jeep Wrangler JL or Gladiator JT.

$30.00

In stock
Vibrant Performance mild steel oxygen sensor weld bung featuring internal M18 x 1.5 threads for exhaust fabrication.
$3.29 $4.50
-27%
Out of stock
Coped titanium O2 sensor bung with M18x1.5 threads for 2.75-inch to 5-inch exhaust tubing

$19.99

Low in stock
Stainless Bros M12x1.25 stainless steel O2 sensor bung plug and copper crush washer.

$7.99

Out of stock
Vibrant Performance 12560 HD Clamp 304 stainless steel weld ferrule for 5 inch OD tubing with O-ring
$244.99 $305.99
-20%
Low in stock
304 stainless steel weld-on ferrule for 4 inch tubing featuring a precision-machined O-ring groove.
$159.99 $199.99
-20%
Out of stock
Vibrant Performance 304 stainless steel HD clamp weld ferrule for 3-inch OD tubing with black rubber O-ring seal.
$116.99 $146.99
-20%
Low in stock
Vibrant Performance 304 stainless steel HD Clamp weld ferrule for 2.5 inch OD tubing with O-ring seal.
$98.99 $124.99
-21%
In stock
Vibrant Performance Grade 5 Titanium weld-on EGT sensor bung with 1/8 inch NPT internal threads.
$16.79 $22.79
-26%
In stock
T304 stainless steel EGT sensor weld bung with 1/8 inch NPT internal threading.
$6.50 $8.79
-26%
Low in stock
Vibrant Performance zinc-plated mild steel hex head oxygen sensor bung plug with M18x1.5 threads
$4.59 $6.29
-27%
In stock
Zinc plated mild steel M18x1.5 hex head oxygen sensor bung plugs, 5-pack bulk set.
$15.50 $20.79
-25%
In stock
Vibrant Performance Grade 5 titanium oxygen sensor weld-on bung with M18 x 1.5 threads
$22.59 $29.99
-25%
In stock
T304 stainless steel M18 x 1.5 oxygen sensor weld-on bung showing precision threads and weld chamfer.
$5.50 $7.50
-27%
In stock
Vibrant Performance T304 stainless steel 30-degree angled oxygen sensor weld-on bung with M18x1.5 threads.
$8.29 $11.29
-27%
In stock
Five Vibrant 30-degree angled T304 stainless steel oxygen sensor weld bungs with M18 x 1.5 threads.
$26.99 $35.99
-25%
In stock
T304 stainless steel saddle style oxygen sensor weld bung with M18 x 1.5 internal threads
$13.99 $18.99
-26%
In stock
A ten pack of Vibrant M8 x 1.0 stand off weld bungs for custom automotive fabrication projects.
$42.99 $57.99
-26%
Low in stock
Vibrant Performance 2.75 inch OD 6061 aluminum weld bung with black anodized threaded cap and sealing O-ring.
$54.99 $70.99
-23%
Low in stock
Vibrant Performance 2-inch aluminum weld bung featuring a warp-resistant flange and an anodized black threaded cap.
$43.99 $58.99
-25%
In stock
Vibrant 11290 2-inch OD 6061 aluminum weld bung with a polished aluminum threaded cap and rubber O-ring.
$42.99 $57.99
-26%
Out of stock
1.5 inch OD 6061 aluminum weld-on tank bung with a black anodized knurled threaded cap and sealing O-ring.
$43.99 $58.99
-25%
In stock

Can’t Find the Part You Need?

Our catalog represents only a portion of the automotive products available through our supplier network. If you cannot find a specific part, brand, or application on our website, submit a request below, and our team will help source it for you.

Please include as much information as possible, such as your vehicle's year, make, model, trim, engine, desired brand, or part number, to help us quickly identify the correct product.

Email is invalid

Image alt