Item Type: Air Compressor Pressure Switch_x000D_Outlet Diameter: Approx. 12mm / 0.47in_x000D_Contact Method: Normally Closed_x000D_Connector Size: 1/4in, female thread. _x000D_Pressure Relief Port Outer Diameter: Approx. 9.5mm / 0.37in_x000D_Maximum Current: 20A_x000D_Working Pressure: 5-8KG, that is 90-125PSI. 1Better Control: Using the pressure generated by the gas on both sides of the valve to better control opening and closing. 2Auto Operation: There is a red ON and OFF switch knob for automatic control on loading and unloading, very energy saving. 3Reliable Works: The working pressure is 5-8KG, that is, 90-125PSI, and the stable work performance ensures high efficiency. 4Great Security: 1/4in female thread together with normally closed contact method enables firm connection without leakage. 5Easy to Install: Comes with a light weight and a compact size as well, the simple installation can be quickly completed.1 x Air Compressor Pressure Switch