All Products › O2 Sensor weld-on bung - 303 Stainless Steel Image 1 of 1 O2 Sensor weld-on bung - 303 Stainless Steel $23.00 O2 Sensor weld-on bung - 303 Stainless Steel Includes: 1 x Weld on Bung - 303 Stainless Steel 1 x Copper washer and 1 x Blanking plug. Quantity: Add To Cart Added! O2 Sensor weld-on bung - 303 Stainless Steel Includes: 1 x Weld on Bung - 303 Stainless Steel 1 x Copper washer and 1 x Blanking plug.