Cylindrical, jacketed, reaction vessel constructed with a flange having a groove formed in the sealing surface of the flange. Flange is also ground to permit a greased seal with any of the lids CG-1940 through CG-1946. Cooling jacket is equipped with 1"; beaded pipe or 30mm Tool-Free™; fittings to reduce the risk of injury while attaching or detaching hose or tubing. Couplings and fittings must be purchased separately. For clamp see CG-141 or CG-141-T. For o-rings/gaskets see CG-147 and CG-147-G series.