Prepare your semi truck to be Ready for the Road Ahead™, with the X-tra Seal Double Seal Valve Cap that provides unapparelled protection against air leakage. By utilizing a double-seal design, this replacement cap prevents the unwanted leakage of compressed air from a tire. Engineered with a compact and snug body to snugly fit over valve stems. FleetPride is your First Click in Heavy Duty®.