Weld-In Bungs, Nuts and Fittings

A quality weld-in bung is a smart way to add an o2 sensor, petcock drain, or plumbing fitting to automotive components like exhaust tubing, oil pans, fuel cells, or...

A quality weld-in bung is a smart way to add an o2 sensor, petcock drain, or plumbing fitting to automotive components like exhaust tubing, oil pans, fuel cells, or intake manifolds. And weld-in bungs are downright essential if you’re building a custom exhaust and need to add an oxygen sensor anywhere in the header tubes or exhaust system.

Better yet, if you’re drilling a hole in your oil pan or fuel cell to add a fitting for something like a drain, fuel line, or an external oil cooler, a weld-in bung can save a ton of time and hassle over cutting, drilling, and tapping one yourself. Weld-in bungs are also handy for folks building custom nitrous systems, where you may need to add an assortment of sensors and injectors to ensure it operates correctly.

Whether your want an aluminum bung or a steel bung, a weld-in threaded bung, or metric weld bung, Summit Racing carries plenty of weld-in options in a range of sizes and threads. From AN and metric thread to trusty NPT, you can find a weld-in bung that’s perfect for your precise need. And having a wide selection of weld-in bungs is vital, because weld-on bungs are ideal for a lot of critical applications, including oxygen sensors, along with any sort of plumbing for external fluid coolers, turbo and supercharger oiling systems, air conditioning lines, and gauges. But again, if you’re here, there’s a good chance it’s because you need a weld-in bung for an oxygen sensor. And for that, we’ve got your covered.

Even if it’s not for an o2 sensor, you can find the best weld-in bung for your needs by using Summit Racing’s handy search filters to narrow down your results. Adjust your filters by vital search parameters like the weld-in bung’s thread pitch, outside diameter, and material. There are hundreds of weld-in bung options to choose from, so there’s a very, very good chance you’ll find the right weld-in fitting or sensor bung for your ride right here at Summit Racing.

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Billet Specialties Weld-in Oil Fill Cap Bungs 24110

Billet Specialties Weld-in Oil Fill Cap Bungs 24110

Fitting, Bung, Weld-In, Female 1 in., Aluminum, Kit

Part Number: BSP-24110

4.43 out of 5 stars ( 7 )

Estimated Ship Date: Tomorrow

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JOES Racing Products Weld-On Bung and Cap Assemblies 37402

Bung and Cap Assembly, Weld-On, Aluminum, Female Threads, 2.375 in. O.D., 2.000 in. I.D., Each

Part Number: JOE-37402

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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JOES Racing Products Weld-On Bung and Cap Assemblies 37400

Bung and Cap Assembly, Weld-On, Aluminum, Female Threads, 1.250 in. O.D., Each

Part Number: JOE-37400

Not Yet Reviewed

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Vibrant Performance Weld Bungs 11291

Weld Bung, Aluminum, Female Threads with Black Aluminum Cap, 2.000 in. Outside Diameter, Each

Part Number: VPE-11291

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Tanks Inc. Fuel Filler Neck Thread-On Bungs 5BS

Weld-On Fuel Filler Neck, 2.250 in. O.D., 3.000 in. Tall, External Threads, Accepts Tanks Inc, CC Aluminum Gas Cap, Stainless Steel, Each

Part Number: TNK-5BS

Not Yet Reviewed

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Tanks Inc. Weld-In Bungs, Nuts and Fittings EZC

BILLET ALUMINUM CAP FOR 1-1/2" BUNG OR GROM

Part Number: TNK-EZC

3.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 3, 2026 if ordered today

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Estimated Ship Date: Apr 3, 2026 if ordered today

Vibrant Performance Weld Bungs 11295

Weld Bung, Aluminum, Female Threads with Black Aluminum Cap, 2.750 in. Outside Diameter, Each

Part Number: VPE-11295

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Vibrant Performance Weld Bungs 11290

Weld Bung, Aluminum, Female Threads with Polished Aluminum Cap, 2.000 in. Outside Diameter, Each

Part Number: VPE-11290

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Moroso Weld-In Bungs, Nuts and Fittings 85296

Fill Cap, Weld-In, W/ Neck/Bung & O-Ring

Part Number: MOR-85296

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

Allstar Performance Weld-In Bungs, Nuts and Fittings ALL40136

Fuel Cell Cap, Fuel Cell Cap and Bung RCI Style

Part Number: AAF-ALL40136

Not Yet Reviewed

Estimated Ship Date: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

Moroso Weld-In Bungs, Nuts and Fittings 85297

Fill Cap, Weld-In, W/ Neck/Bung & O-Ring, Black Powder Coat

Part Number: MOR-85297

Not Yet Reviewed

Estimated Ship Date: Apr 20, 2026 if ordered today

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Estimated Ship Date: Apr 20, 2026 if ordered today

NGK Weld-in Oxygen Sensor Bungs and Plugs 91301

Fitting, Bung, Weld-In, Oxygen Sensor, Female 18mm x 1.5, Stainless Bung, Steel Plug, Each

Part Number: NGK-91301

4.36 out of 5 stars ( 22 )

Estimated Ship Date: Tomorrow

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Haltech Weld-On Fitting Kits HT-010812

Fitting Kit, Weld-On, Stainless Steel, Natural, 1/4 in., Nut and Ferrule, Kit

Part Number: HTH-HT-010812

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Lowdoller Motorsports Weld-In Bung Fittings 153322

Fitting, Bung, Weld-In, EGT Sensor, 1/8 in., Stainless Steel, Each

Part Number: LDM-153322

Not Yet Reviewed

Estimated Ship Date: Apr 14, 2026 if ordered today

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Estimated Ship Date: Apr 14, 2026 if ordered today

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