VIAIR 450C 150 PSI Dual Performance Value Pack - Silver,45012 TWO Silver 12 VOLT 450C air compressors - 150 PSI MAX Working pressure, engine must be running during use. 3.28 CFM Free Flow @ 0PSI 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 a 2.5 gallon air tank from 0 to 145PSI in 1 minutes and 30 seconds. Can fill at 5.0 gallon air tank from 0 to 145 PSI in 3 minutes and 10 seconds.