With a polyurethane bowl and housing, these dryers resist synthetic compressor lubricants, solvents, acids, and other chemicals in your compressed air line. They have a clear bowl so you can monitor contents and the desiccant, which changes color when it needs to be replaced. These dryers use clay desiccant to remove moisture, oil, and particles—no need for a separate filter and dryer. Place them down the line from aftercoolers and separators, which remove most of the water first.