Reaction vessels feature groove in the ceiling surface.

• Cylindrical reaction vessel constructed with a flange
• Having a groove formed in the sealing surface of the flange

The unique design of the Chem-Drain valve incorporates a PTFE plunger that allows the contents of the flask to drain directly through the bore of the plunger. When closed, the tip of the PTFE plug seals into the lower radius of the flask avoiding the dead space normally associated with standard stopcock drains. This feature permits total mixing and drainage of the contents of the flask.

Flange is also ground to permit a greased seal with any of the lids CG-1940 through CG-1946. For clamp see CG-141 or CG-141-T. For O-ring see CG-147.