The Original Tyre DeflatorThe Original Staun Tyre Deflator is the simple, no nonsense way to get your pressures right before you hit the sand or head off road. Screw them onto any standard valve and theyll automatically drop each tyre to your preset pressure without you standing around watching a gauge. Each unit is fully adjustable from 6 to 30 psi, and they come preset at 18 psi straight out of the pouch. If your tyre is more than 12 psi above your target, theyll start