Firestone air accessory systems provide an instant air source for all air suspension products, including Coil-Rite, Ride-Rite, and Sport-Rite Air Bags. Simply flip a switch and adjust the ride for various loading conditions. The single air command inflates both air springs equally through the use of a height control valve. For use with: Coil-Rite Air Bag Helper Springs, Ride-Rite Air Bag Helper Springs, and Sport-Rite Air Bag Helper Springs.