Staun Tire Deflators (click image to englarge)Automatic Tire deflators for the use of inAir Downin or the reduction of tire pressure when taking your 4wd or off road vehicle onto softer surfaces such as the beach, desert, or mud driving The Staun Tire Deflator is the simplest way to reduce tire pressure All you need to do is 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 you are running at on a different surface This is achieved with out the use of a tool