Product Details: Outfit your semi to be Ready for the Road Ahead™ with an equal distribution of tire pressure, with the Dual Dynamics 100 psi Cross Fire™ Dual Tire Pressure Equalization System. Thanks to its sophisticated design, this replacement valve is able to seamlessly mount between dual tires to allow for a free flow of air to maintain equal pressure levels. Crafted with ultra-strong materials to withstand extreme pressure levels. FleetPride is your First Click in Heavy Duty®.