The JK6450 Upgrade kit for the Klein JL-JK-OBA and JKOBA onboard air systems include the Waterproof Heavy Duty 6450RC compressor (a Kleinn exclusive design), wiring kit with relay, remote quick connect mount, tire inflator with locking air chuck and storage bag as well as all the necessary hardware and fittings. The kit mounts to existing studs in the JL-JK-OBA and JKOBA mounting brackets and connects to a dedicated port on the tank. With the JK6450 Upgrade kit you can quickly and easily air up two 37 inch tires simultaneously.