The RF M18 x 1.5mm Stainless Steel Bung is a weld-in boss tapped to the standard M18 x 1.5mm oxygen sensor thread, letting you add or relocate an O2 port anywhere on a custom exhaust or header. Drill a hole in the pipe, weld in the bung, and thread in the sensor.
Specifications
- Thread: M18 x 1.5mm (standard O2 sensor)
- Type: Weld-in bung
- Material: Stainless steel
Applications
Used when building or modifying a custom exhaust that needs an additional O2 sensor bung — wideband tuning sensors, rear cat monitors, and relocation for aftermarket headers or downpipes.






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