Keeping you Ready for the Road Ahead , the Prima Brake Components Non-Vented Dummy Gladhand boasts an air-tight seal to ensure dirt and debris cannot enter into the air brake system when gladhand is not in use. This specialized component designed for use in air brake systems in heavy duty vehicles such as trucks, trailers, and buses. Comprised of steel, it is sturdy to ensure long-lasting performance in even the toughest conditions. FleetPride is your First Click in Heavy Duty .