VIAIR 400C 150 PSI Dual Performance Value Pack - Chrome TWO Chrome 12 VOLT 400C Air Compressors - 150 PSI MAX Working pressure, engine must be running during use. 4.55 CFM Free Flow @ 0 PSI Comes with two heavy duty 40-amp relays and a 110 to 145 PSI Pressure switch, please consult website for wiring diagram. Built-in thermal overload protector serves to protect the compressor from overheating the in harshest operating environments. Can fill at 2.5 gallon tank from 0 to 145PSI in 1 minutes and 8 seconds. Can fill at 5.0 gallon air tank from 0 to 145PSI in 2 minutes and 20 seconds.