These polycarbodrying columns are suitable for most laboratory applications and will dry air to a dew point of -100 ° F at atmospheric pressure or pressures up to 90 psig. Columns consist of a plastic cap, 303 stainless steel desiccant supports and coil springs, felt filters, and O-ring gasket. Inlet and outlet ports accept 1/4" to 3/8" ID (0.6 to 1.0 cm) tubing. Comes filled with 1 1/4 lb of 8 mesh indicating Drierite desiccant (anhydrous calcium sulfate). Order additional desiccant separately.