The OTR Type AD-IS Style Air Dryer, made with Expertise Built In™, completely filters out water, vapor, oil vapor, and other toxins before they get to the air tanks and valves. This heavy duty air dryer thoroughly blocks freeze-up during cold and harsh weather environments. Heavy duty trucks rely on compressed air to actuate braking systems and control the brake operation; this OTR heavy duty air dryer ensures your braking system is in peak condition. FleetPride is your First Click in Heavy Duty®.