OEM Factory Custom Auto Parts O2 Oxygen Sensor M18X1.5 Female Threaded Stainless Steel 18mm x 1.5 Weld In 02 Bung Female Fitting Oxygen Sensor Vibrant Performance Standard O2 Oxygen Sensor Weld Bung T304 Stainless SBP Aluminum O2 Sensor Weld Bung M18 x 1.5 SBP Straightboost Weld On O2 Sensor Bung M18 x 1.5 Stainless Steel Saddle Speedflow M18 O2 Sensor Weld Bung. 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.