Sold as singles or choose quantity 2 for twin cylinders, use these stainless steel bung plugs to plug O2 bungs that have had the stock O2's removed. O2's are typically removed when using Rottweiler Fueling Dongles or a Powercommander. All 990's and the RC8 have 18mm x 1.5 O2 bungs stock. Also available in mild steel. (1190 and 1290, look for 12mm bung plugs here)
Note and precautions: These O2 plugs are a higher end product designed for anti corrosion and long life. See our mild steel plugs for a more affordable alternative but may rust.