Used to Regulate the Tank Pressure Between Two Preset Values on Small (Up to 175 PSI) Electrically Driven Air Compressors Silver Cad-Oxide Brazed Contact Provides Superior Performance and Extends the Life of the Switch Newly Designed Unloader Valve Can be Rotated into 8 Positions, Preventing the Compressor from Starting Under Load Auto – Off Disconnect Lever is Available for Manual Cut Off of the Compressor 80-100 PSI Factory Setting Cut In/Cut Out Pressure, 60 PSI Min Cut In, 110 PSI Max Cut out