Automatic Tire Deflators Brass Set of 4 from Bulldog Winch.
Features:

• Set of 4
• Setting Ranges from 5 to 30 PSI - Factory pre-set at 15 PSI
• Quickly air down 4 tires at ttrail head
• Simply thread onto tire valves and deflators deflate tires to a pre-set pressure - Remove and head out on your off-road adventure
• High quality machined brass components
• Easily adjusted and position secures with locking nut
• Premium storage case included
• Deflating tires to a lower pressure improves off-road traction and smoothes out vehicle ride