- 18mm Threaded Aluminum Bung Plug
- Plug tapped M12 x 1.25 to accept many OEM (stock) O2 Sensors
Includes an aluminum bung to allow the use of an OEM oxygen sensor. If your Brock's Performance exhaust system has an O2 sensor bung pre-installed, the plug can be used to install an OEM (stock) 12mm O2 sensor.