Size: This Pressure Switch Features a 6.3 mm Nnloader Valve Connection and a 1/4 Inch NPT Female Connection. With a Relief Valve, it can Correct Operation of the Air Compressor.<br> Project ModelLF10-4H NPT1/4-95-125 PSI 20A. With an Unloader Control Valve and On/Off Switch.<br> Convenient to Use: The Four-port Manifold Gives You the Flexibility to Mount the Switch. The four-port Manifold Gives You the Option to Mount in it Any Direction and to Also Have the Option to Add a Relief Valve, Gauge, or Multiple Air Outlet Ports. The Switch is Preset to Turn on the Compressor at 95 PSI and Turn off the Compressor at 125 PSI.<br> Intelligent Handle Design: The Built-in On/Off Metal Lever and Unloader Located on the Side of the Switch Allow You to Easily Cut off Air Compressor and 4-port Base Simply the Mountion of Exhaust Valve and Pressure Gauge.