Product Details: The WABCO SS1200P Oil Coalescing 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. Through the use of an internal desiccant, this filtration system prevents moisture and liquids from entering your supply and wet tanks by collecting contaminants. Symptoms of a bad air dryer in need of replacement are leaking air, blocked purge valves, or poor-performing condensers unable to receive built pressure. This part can replace air dryers on specific models of trucks from brands such as Mack, Meritor, and Volvo. FleetPride is your First Click in Heavy Duty®.