The AltitudeCraft Auto-Stop Tire Deflator Kit makes airing down fast and hands-free. Pre-set your target PSI on the brass body, lock the double-nut, screw onto all 4 valves, and walk away - the check-ball mechanism stops at your set pressure. Adjustable 10-30 PSI with a laser-etched scale, solid brass body, stainless-steel spring, and 4 aluminum alloy valve caps that resist corrosion. Includes a zippered storage pouch. Built for off-road trucks, SUVs, ATV, UTV, RV, overlanding, beach driving, and trail use.