Haltech O2 Sensor Weld-On Bung w/Copper Washer & Blanking Plug M18 x1.5

This kit from Haltech gives you everything you need to add an O2 sensor bung to your exhaust system. You get the weld-on bung itself, a copper washer to help seal the sensor, and a blanking plug so you can cap off the bung when the O2 sensor isn't installed. It's designed for an M18 x 1.5 thread size, which is a common size for many wideband O2 sensors.

Adding an O2 sensor bung is a common step when you're installing a wideband air/fuel ratio gauge or a standalone engine management system that needs to read exhaust gas oxygen content. This bung is made to be welded onto your exhaust pipe, giving you a secure and leak-free mounting point for your sensor. The included blanking plug is handy for when you need to remove the O2 sensor for maintenance or if you're just temporarily capping the port.