O2 Stainless Steel Exhaust Lambda Oxygen Sensor Boss Nut & Cap Bung Kit M18x1.5
M18 x 1.5 Exhaust Lambda Boss Nut Weld on in 304 Stainless O2 Oxygen Sensor Bung. -O2 Oxygen Sensor Bung+Plug Kit. 1x Oxygen Sensor Nut Bung Stepped. -Designed to adding a O2 sensor in any place you need.