The J.T. Brooks Automatic Tire Deflators Pro set eliminates the need to squat down and run from tire to tire trying to set each tire to the correct PSI for maximum off-road traction. Do you deflate to different pressures often or don’t want to be bothered with the calibration process using a tire deflated to your desired PSI? Simply dial in your desired PSI using the laser engraved PSI scale! These deflators will automatically and accurately deflate your tires to a set PSIOnce you dial in your PSI, simply lock the tire deflators in place with the lock nut, screw them onto each tire’s valve stem, and let them do the work. The deflators will automatically shut off when the desired PSI is reached. By screwing one deflator on to each tire, all tires can be deflated simultaneously. This allows the user to complete other tasks while all tires are deflating. Simply dial in your desired PSI and goLaser engraved PSI scaleAdjustable from 3-32 PSIStainless steel precision spring for increased accuracyNickel plated brass for superior durabilityManual activation knob starts deflation at any pressureDeflate all 4 tires at once!O-Ring seal for increased accuracyClear stop in deflation when set PSI is reached (Snap Shut Action!)Easy to use directions includedComes apart in two pieces for easy cleaningIncludes storage pouchProtective plastic bag included to help maintain set PSIMade in the U.S.A*This is an approximate PSI. Always verify tire pressure after a new setting has been selected.