AirMax Heavy Duty Valve Stem Extension Kit. For Dual Rear Wheels 19.5" to 24.5" Wheels. Fits Wheels with Lug Nuts 1 3/16" and Larger (use our part number AML1 for 1 1/16" smaller). Includes Four Braided Hoses and Brackets.
Checking the pressure and refueling has become much easier. If one went off; The hole is too big for the bolt so a large fender washer had to be added to center and stabilize the mount.
Quality seems good but not for a 19.5" RV chassis. The brackets are designed for a 22.5" wheel stud, the hole on the bracket is 1 5/8" diameter, my Ford F53 -Chassis mounting nuts are much smaller Make brackets for mounting to hub at 1" intervals.
Did about 4000 miles on the kit and no complaints so far. Bracket placement and hose routing must be carefully considered. I had to bend the end tabs a bit to keep the angles of the tubing to a minimum. Simplifies and speeds up tire maintenance and provides quick access to TPMS transmitters. Highly recommended!