Product Details: Get your semi Ready for the Road Ahead™ with an equal distribution of tire pressure, with the Dual Dynamics 105 psi Cross Fire™ Dual Tire Pressure Equalization System. This replacement valve seamlessly mounts between dual tires, allowing air to freely flow between the two to maintain equal pressure levels. Engineered with top-tier materials to endure extreme pressure levels. FleetPride is your First Click in Heavy Duty®.