Size: This pressure switch features a 6.3 mm quick-connect outlet and a 1/4 inch NPT female connection. With a built-in relief valve, it ensures proper operation of the air compressor. Model: LF10-4H NPT1/4-95-125 PSI 20A. Includes an unloader control valve and on/off switch. Convenient to use: The four-port manifold provides flexibility for mounting the switch in any direction. It allows options to add a relief valve, pressure gauge, or multiple air outlet ports. The switch is preset to turn on the compressor at 95 PSI and turn off at 125 PSI. Intelligent handle design: The built-in on/off metal lever and unloader located on the side of the switch allow easy shutdown of the air compressor. The four-port base simplifies the installation of an exhaust valve and pressure gauge.