The JL-JK-OBA Onboard Air System is a heavy-duty high volume air source to inflate tires at the end of a day of four wheeling, power air lockers, air tools and of course Kleinn Air Horns. The kit is 100% bolt-on using common hand tools and has everything needed for installation. The heavy-duty WATERPROOF air compressor and tank easily handle 37" tires and are protected by a steel cage with integral skid plate. The kit is upgradeable to a second compressor with mounting studs and air ports already installed (P/N JK6450); giving you the ability to air up two 37" tires at the same time.