Sold as singles or choose quantity 2 for twin cylinders, use these mild 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 304 stainless steel. (1190 and 1290, look for 12mm bung plugs here)
Note and precautions: These O2 plugs are an affordable option to plugging your O2 sensor bungs but can and may rust. See our 304 stainless plugs for superior corrosion resistance.