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.