18mm O2 Sensor Weld-on Bung/Plug + Cap

This O2 bung can be welded to mild-steel and stainless steel exhaust piping, and fit sensors with a 16mm lug thread. Suitable for mounting non-Efi exhausts on bikes that need to use an oxygen sensor, or if you need to monitor air/fuel ratio and tuning a wideband ECU. Cap it off when you don't need it with the hex key cap included.