This 3-way exhaust back pressure tester pinpoints blockages in catalytic converters and mufflers by testing through oxygen sensor ports, exhaust pipes, or air injection systems. It includes M12 and M18 threaded adapters, a flange and gasket for specific sensor types, and four rubber adapters for air injection pipe inlets. The dual-scale gauge uses multi-colored bands to indicate pressure at idle and 2500 RPM, while the 6' (1.8 m) hose provides enough length to monitor readings from the driver's seat.

This 3-way exhaust back pressure tester pinpoints blockages in catalytic converters and mufflers by testing through oxygen sensor ports, exhaust pipes, or air injection systems. It includes M12 and M18 threaded adapters, a flange and gasket for specific sensor types, and four rubber adapters for air injection pipe inlets. The dual-scale gauge uses multi-colored bands to indicate pressure at idle and 2500 RPM, while the 6' (1.8 m) hose provides enough length to monitor readings from the driver's seat.