Universal, Oxygen Sensor Bung, Standard Oxygen Sensor Bungs (Box of 100, Bulk Pack), Standard Oxygen Sensor Bungs (Box of 100, Bulk Pack), S.S. WELD BUNGS, Exhaust Bungs, Vibrant Performance Standard Oxygen Sensor Bung is made of 304 Stainless Steel and mild steel., SSO2SenM18x1.5-100Pk.