2PC Exhaust Lambda Boss Nut Weld on in Stainless M18 x 1.5 O2 Oxygen Sensor Bung
Size: standard M18 X 1.5 thread (both bung and plug). O2 Oxygen Sensor Bung+Plug Kit. 2 x O2 Oxygen Sensor Bung. Easy to weld on. 2 x O2 Oxygen Sensor Plug. Designed to adding a O2 sensor in any place you need.