Product Details: Get Ready for the Road Ahead® with clean and dry compressed air that enhances brake performance, thanks to the WABCO SS1800P Air Dryer. With the help of an internal desiccant, this air dryer filters moisture from compressed air before it can reach your wet and supply tanks. As a result, your brake lines receive cleaner, dryer air to help actuate brake operation. Symptoms of a bad air dryer in need of replacement are leaking air, blocked purge valves, or poor-performing condensers that are unable to receive built pressure. Includes a pre-installed turbo-cut-off valve. FleetPride is your First Click in Heavy Duty®.