VIAIR X'treme Duty Onboard Air System,10009 Intended for inflation of up to 37" tires. Designed to be installed and mounted onto the vehicle. Includes all parts needed for installation of you very own onboard air solution for tire maintenance and small pneumatic tools Comes with two VIAIR 350C air compressors and a 110 to 145 PSI Pressure switch. 150 PSI maximum working pressure and 33% duty cycle Can inflate four tires up to 40 inches in diameter. One year manufacturer's defect warranty included with copy of the receipt. Please check the manufacturer's website for a wiring diagram. Ingress Protection Rating: IP67