Single Port Pressure Switch Air Compressor Pressure On/Off Switch Single Port Air Compressor Pressure Switch With a magnetic starter you can use it for any HP. The switch turns the compressor on automatically when your pressure drops below 110 PSI and then off again once you reach 150 PSI In case of any doubt, we are here to help: Please contact us. Heavy Duty 26 Amp Air Compressor Pressure Switch Control 95-125 PSI Four Port 1/4 FEMALE NPT TANK CONNECTION. MAX PRESSURE: 175 PSI MIN ON: 50 PSI, 20AMP , DIFFERENTIAL: 35-50 PSI Air Compressor Pump Pressure Control Switch Valve 110-150PSI 1 Port On/Off Lever High Quality Universal Replacement. No Drift Pressure Setting., Captive Cover Screw., Ample Wiring Room., 2 Ground Screw., Easy to Adjust., Pulsation Dampener Standard. 110-150 psi factory preset regulated., No Wire Looping., Visible Contact.