SBP Aluminum O2 Sensor Weld Bung M18 x 1.5 SBP Straightboost Vibrant Standard Oxygen Sensor Weld Bungs T304 Stainless Steel 1194 Zoro Weld O2 Sensor Bung 18mm x 1.5 M18 X 1.5 T304 Stainless Steel Nut Aeroflow Weld Bung O2 Oxy Sensor S S M18 X 1.5mm Thread All Sensors Oxygen Sensor O2 Weld on Stepped Nut & Cap Bung Kit M18*1.5 Thread S1P2. Vibrant Performance saddle style weld on oxygen sensor bung is made of 304 Stainless Steel for the utmost in optimum corrosion resistance. Vibrant Performance saddle style weld on oxygen sensor bungs feature a radius design which allows for a cleaner weld to tubing.