Review on 🔧 Efficient 5-Piece Brass Tire Deflators Kit: Adjustable Valve for Vehicles, Motorcycle, Car, Truck - 6-30 PSI by Prince Ruffins

No instructions. I had to cut the spring 1.5 turns for it to stop at about 10psi. .Only unscrew the top part of the cap until the air starts to stop. Unscrew the retaining ring until it rests against the underside of the cover. Repeat with all 4. Test on another tire. Above. Again, I couldn't get my spring where I wanted, so I cut a half-circle step off the spring until it was 10psi at the midpoint of the adjustment.