Drying unit is a plastic cylinder (2.5"" dia. x 11.5"" high) with metal fittings, felt filter pads, screw cap, support grill, and spring. Will hold 650 grams of Indicating Drierite. Unit permits dry gases to be available when required. Approx. 2200 liters of air saturated with moisture at 70°F and 740 mm pressure can be dried to dew-point of approx. -100°F. Can be regenerated in oven in 2 hours at 230°C.