Vacuum chamber assembly includes transparent jar, neoprene gasket and vacuum plate with adapter for 1/4"" I.D. tubing. No. 743-600-02 polycarbonate (PC) jar has a white polypropylene plate, and is for use only with non-aggressive chemicals. Nos. 743-600-04 and 743-600-06 jars are pale amber polyethylerimide (PEI) and come with white polycarbonate plates. They have excellent resistance to acids, bases, aliphatic alcohols, hydrocarbons and saturated halogenated hydrocarbons.