Product Details: The WABCO SS1800UP Air Dryer ensures you're Ready for the Road Ahead® with clean and dry compressed air for a responsive brake system. This air dryer seamlessly removes moisture and vapors from the compressed air to prevent contaminants from entering your supply and wet tanks. Thanks to the filtering desiccant, your brake system can experience far fewer damaging contaminants. To confirm your air dryer needs replacing, check for signs such as leaking air, blocked purge valves, or poor-performing condensers that are unable to receive built pressure. FleetPride is your First Click in Heavy Duty®.