Staun Tire Deflators SCV5"GUARANTEED TO LET YOU DOWN" Staun tire deflators are the easy way to deflate your tire for increased off road traction. Simply screws onto your tire valve to automatically deflate all tires to your preset pressure. Just screw the valve onto the valve stem and walk away. The deflator will do the rest. Once you have preset the valve you will not have to set them again, unless you wish to change the pressure setting. Adjustable from 6 30 psi. Factory