GlowShift’s Wideband Air/Fuel Ratio Oxygen Sensor Bung + Plug Set was designed for easily adding a wideband oxygen sensor to your car by welding the bung into the exhaust system. This set is available in 2 different bung material options, 304 stainless steel or mild steel. This adapter is 1/2” tall with a thread size of 18mm x 1.5mm, which is standard with most O2 sensors. Plus the kit includes the plug in the event the bung is installed before finalizing the installation of the Wideband Gauge and oxygen sensor. GlowShift also includes unlimited tech support and a one-year limited warranty with each purchase.