McMaster 5163K21 Desiccant Compressed Air Dryer, Plastic Bowl with Steel Guard, 1/2 NPT Female, 10 scfm

Once aftercoolers and separators have removed the bulk of the water, use these dryers to remove any remaining moisture in your air line. To reuse saturated desiccant, heat it in an oven at its reactivation temperature—you'll know it's dry when the color changes. Install these dryers after an oil filter to protect the desiccant.

Clear Bowl — Dryers with a clear bowl or a sight glass let you keep an eye on the contents inside.