Compressed air dryers are devices that remove moisture from compressed air systems. Moisture can cause corrosion, reduce efficiency, and damage equipment. These dryers work by cooling the air, which condenses the moisture, or by using desiccants that absorb water vapor. There are different types of compressed air dryers, including refrigerated dryers and desiccant dryers. Refrigerated dryers cool the air to a low temperature, while desiccant dryers use materials that attract and hold moisture. Properly maintaining compressed air dryers is essential for ensuring the longevity and reliability of compressed air systems.