VIAIR 400H Hardmount Compressor 12 VOLT - 150PSI Max Working Pressure, engine must be running during use. 2.54 CFM Free Flow @ 0 PSI, good for up to 35 Inch Off-road Tires Hardmount compressor using vibration isolators and heavy duty wire. For off-road vehicles: Jeeps, Trucks, and crawlers. Environmentally sealed On/Off switch Convenient 1/4" Quick Connect Stud connection (Air hose not included)