(2 Sets) Bung Plug & Nut Cap Kit O2 Oxygen Sensor Weld On / Weld In M18 x 1.5

2 Sets O2 Oxygen Sensor Weld On / Weld In Bung Plug & Nut Cap Kit M18 x 1.5. Type: Oxygen Sensor Bung / Curve Notched Adapter. Material: Bung----Stainless Steel 304, Plug----Iron. ⑤ Complete continuous weld around entire bung base circumference.