5Pcs/Set Exhaust Lambda Boss Nut Weld on / in M18x1.5 O2 Oxygen Sensor Bung
M18 x 1.5 Exhaust Lambda Boss Nut Weld on in 304 Stainless O2 Oxygen Sensor Bung. -O2 Oxygen Sensor Bung+Plug Kit. 5x Oxygen Sensor Nut Bung Stepped. -Easy to weld on. -Designed to adding a O2 sensor in any place you need.