Product Details: With Expertise Built In®, the OTR Type AD-IS Style Air Dryer is the ideal choice to keep compressed air clean and dry for optimal brake performance. Through the use of an internal desiccant, this filtration system prevents moisture and liquids from entering your supply and wet tanks by collecting contaminants. It efficiently filters out water, vapor, oil vapor, and other toxins before they can cause damage to your brake system. Air dryers in need of replacement often show symptoms 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®.