The OTR Type 1200 Style Air Dryer, being made with Expertise Built In, efficiently 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 compressor's compressed dry air to actuate braking systems and control the brake operation.Symptoms of a bad air dryer in need of replacement are leaking air, blocked purge valves, or poor performing condensers unable to receive built pressure. This OTR heavy duty air dryer ensures your braking system is in peak condition. FleetPride is your First Click in Heavy Duty.