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Machinery Parts Trading Dryers Replacement suitable for Caterpillar® equipment and many other heavy equipment industries. Functions of an AC Dryer: 1. To act as a temporary storage container for oil and refrigerant when neither are needed for system operation. 2. Trap debris that may be inside the A/C system. 3. Absorb moisture (water) that may have gotten inside the A/C system. At Machinery Parts Trading you are guaranteed to get high quality dryers at competitive prices with superior quality.