Need to "air down" fast? This automatic tire deflator from Trailhead is the fastest way to air down your Jeep tires!These easy to use tire deflators accurately, evenly and instantly deflate all four tires to a pre-set pressure. These deflators work while your Jeep is at a standstill or driving at less than 20 mph. Just screw on, drive off, and deflate! This kit includes 4 screw-on anodized aluminum deflators, a slide-scale pressure chart, a high quality pressure gauge, a weather-proof instruction manual and an allen wrench adjustment tool. The entire Trailhead tire deflator kit fits easily into your glove compartment and has a LIFETIME WARRANTY!