O2 Sensor Weldable Fitting Bung and Blanking Plug M18 x1.5

The Haltech O2 Sensor Weldable Fitting Bung and Blanking Plug features M18 x1.5 threading to suit most wideband oxygen sensors used in performance tuning applications. This bung is designed for permanent installation via welding into exhaust systems, providing a secure, leak-free mounting point for accurate air-fuel ratio monitoring. The included blanking plug allows you to seal the fitting when sensor removal is required for maintenance or testing. Essential for custom exhaust fabrication and EFI tuning setups where precise lambda readings are critical for engine calibration.