Basically you screw onto the tyre valve. It will hiss until it stops at your preset psi pressure level (say 20 psi is a general beach driving pressure). Take the unit off your tyre and enjoy safe beach driving.
All 4 units can be put on continually then screwed off straight away. Or 2 can be set for 20psi and 2 for rougher 15psi conditions.
- Comes with small carry leather pouch.
- Solid brass fittings that are rustproof and reliable.
- Each unit has to be pre-calibrated by you ( from 6 to 30 psi) with easy to follow instructions.
- 1 year warranty.