304 Stainless Steel O₂ Sensor Bung (M18×1.5) – Pre-Notched with Heat-Sink, Weld-On

Weld Smarter. Control Heat. Maximise Performance.

Engineered for elite fabricators and serious tuners, this 304-grade stainless steel weld-on O₂ sensor bung is crafted with both precision and function in mind. Featuring a universal M18×1.5 thread, it’s pre-notched to seamlessly contour to 3", 3.5", and 4" tubing—no guesswork, just perfect weld alignment. The integrated machined heat-sink channels heat away from your sensor, enhancing accuracy and extending sensor life in high-temp environments.

Built to Perform:

• Premium 304 Stainless Steel — Offers stellar durability and corrosion resistance under extreme exhaust conditions.

• Pre-notched Precision Fit — Expertly pre-cut to hug 3", 3.5", and 4" curved pipes for hassle-free welding.

• Heat-Sink Fusion — Finned design crafted to dissipate heat, shielding your wideband O₂ sensor from thermal stress.

• Standard Threading — M18×1.5 ensures broad compatibility with OEM and aftermarket O₂ sensors.

Why It’s a Game-Changer:

• Pinpoint alignment saves time on fabrication, while delivering leak-free sensor welds.

• Thermal control protects sensor readings, keeping your tune accurate—even under harsh conditions.

• Rugged and reliable, engineered to last through aggressive driving and daily wear.

Best for: custom exhaust builds, turbo systems, downpipes, ECU tuning setups, and OEM exhaust repairs. Trust Bend Brothers—proven in speed, reliability, and delivery.