Drying Tube for Air and Gases. Indicating DRIERITE in this plastic unit dries air and gases for small scale laboratory applications. A rubber hose connection provides an immediate flow of dry gas. Excellent as venting drier on reagent bottles, reaction apparatus, or instrument compartment, sample preparation, gravimetric determination of water vapor and drying of gases for purging and blanketing of moisture sensitive materials. Tube is polycarbonate. End caps are molded polypropylene with a 20 Micron polypropylene filter in each end. Note: Do not use this drier in the presence of vapors or liquids containing phosphate esters, synthetic lubricants, hydrocarbon solvents, methanol, acetone, lacquer solvents, or other organics.