Why replace an exhaust pipe because of a corroded, stripped or damaged oxygen sensor bung? Save the pipe and replace the bung with this weld-on replacement. Standard O2 sensor threads for a universal fit. Perfect for repairs or custom installations. Repair-friendly solution - this oxygen sensor bung allows replacement of a damaged fitting without replacing the entire exhaust component. Universal fitment - designed to accommodate standard oxygen sensor threads. Weld-on installation - permanent repair requires no additional hardware. Quality materials - made of carbon steel for a clean weld and durable service.