100 PSI Max Rating, 120V, 4A Vehicle mount compressor ensures air brake system is properly pressurized for immediate truck departure from station Automatically purges water separator bowl every time compressor cycles off via a normally open solenoid Pressure switch regulated operation automatically senses low pressure in air system and restores proper pressure, preventing brake lock-up No interference with engine mounted air compressor Factory set PSI actuation points: 75 "On", 95 "Off" with Adjustment differential 20 PSI Sealed ball bearings for long service life Compact size 1 year warranty