Update your semi truck with properly inflated tires, with the X-tra Seal 3-1/2" TR545D Heavy Duty Nickel-Plated Brass Tire Valve Stem that ensures you're Ready for the Road Ahead™. Due to its ability to act as the entry point for compressed air, this replacement stem allows operators to add or remove air in the case of leaks or over pressurization. Manufactured with a rigid cap to prevent damage to the metal stem. FleetPride is your First Click in Heavy Duty®.