O2 bung m18 x 1-1/2in

The Stainless Works O2 bung M18 x 1-1/2in is a weld-on oxygen sensor bung designed for exhaust system fabrication and modification. This stainless steel component provides a threaded port for securing an oxygen sensor into custom or modified exhaust piping, making it essential for builders working with performance exhaust systems, engine swaps, and aftermarket tuning applications where OEM sensor bungs are unavailable or incompatible.

The bung features an M18 x 1-1/2in female thread specification, accepting standard oxygen sensors without adapter hardware. The 1.55-inch weld-on base is designed for direct welding to exhaust tubing, creating a permanent, leak-free installation. Constructed entirely from stainless steel in natural finish, this component resists corrosion from high-temperature exhaust gas exposure and thermal cycling—critical for longevity in underhood environments where carbon steel would rapidly oxidize.

This oxygen sensor bung is ideal for exhaust system builders, engine builders performing modifications, and tuners installing wideband or narrowband oxygen sensors in vehicles with fabricated or heavily modified exhaust systems. It suits both street and track applications where proper sensor placement and secure mounting are required for accurate engine management and emissions diagnostics. Sold individually, this bung integrates with various exhaust setups.