Product Details: The OTR Type F/AD-IP Style Air Dryer ensures Expertise Built In™, thoroughly filtering out water, vapor, oil vapor, and other toxins before they get to the air compressor tanks and valves. This heavy duty air dryer completely blocks freeze-up during cold and harsh weather conditions. Heavy duty trucks lean on the compression of air to actuate braking systems and control the brake operation; this OTR heavy duty air dryer ensures your braking system is in optimal condition. FleetPride is your First Click in Heavy Duty®.