Fab-Pros plug for the O2 Bung with 18mm x 1.5 threads. Do not use other models with the allen wrench and risk the plug getting seized or stuck onto the bung where you'll have to break tools and strip parts trying to remove the plug.
Plug for O2 Sensor Bung M18 X 1.5 Threads - Male - 10-PACK with exped. shipping
Plug for O2 Sensor Bung M18 X 1.5 Threads - Male
Vibrant Performance Threaded Hex Bolt for Plugging O2 Sensor Bungs Plug delete
10PACK O2 OXYGEN SENSOR BUNG M18 X 1.5 Notched Weld on O2 SENSOR Bung 304 Steel
10 Pcs O2 OXYGEN SENSOR BUNG M18 X 1.5 Notched Weld on O2 SENSOR Bung 304 Steel