PLUG & PLAY  is a complete air management system which includes Compressor, Backflow Check Valve, Pressure shutoff switch, 100Amp magnetic Solenoid, 50 Amp Circuit Breaker which are all 100% installed for you.  There is nothing else for you to do except add the tank and run the airhoses to the airbags.  You do not have to install about a half mile of wiring and 100 fittings with 100 possible leak points, or pay an installer $75 an hour to put together a puzzle that takes up to 3 days to figure out.  All of the components at the right are included in the box.Save 16hrs of hair-pulling grief