The WABCO SS1800UP Air Dryer is the perfect solution to make sure your heavy duty trucks are Ready for the Road Ahead® with dry, compressed air that efficiently actuates braking systems and operation. This replacement part effectively removes liquids and water vapors from compressed air to prevent contaminants from entering your wet and supply tanks. As a result, your brake lines experience far less wear and tear, leading to an extended lifetime. Symptoms of an air dryer in need of replacement are leaking air, blocked purge valves, or poor-performing condensers unable to receive built pressure. FleetPride is your First Click in Heavy Duty®.