AEM No-Weld O2 Sensor Mount AEM No-Weld O2 Sensor Mount for 2.75 to 3 inch Diameter Pipe No-Weld O2 Sensor No-Weld O2 Mount No welding equipment? No problem with AEM's No-Weld O2 Sensor Mounts. These mounts have an integrated bung that makes it easy to install a wideband UEGO air/fuel ratio sensor using just a drill and the supplied hardware. The no-weld O2 sensor mount fits 1.75" to 3.0" exhaust pipe diameters. 3-inch No-Weld O2 Sensor Mount, Allows Users to Install O2 Sensor(s) Without Welding a Bung to Exhaust Pipe -Clamp comes with adhesive for tight seal with clamp nuts. -No need to weld O2 bung into exhaust. 3 in No-Weld O2 Sensor Mount UEGO CLAMP KIT 275 to 300 -Made of stainless steel. AEM - No-Weld O2 Mount -3in pipe diameter. Oxygen Sensor Bung AEMEOXYGSENS 3 in.