Product#: TG-6871 Availability: This item normally ships within 1 - 2 business days. Description: Diameter of flask is 100 mm and condensing surface is 80 mm which provides an annular path of 20 mm. Sublimate collects on the flat surface of the condenser which is parallel to the inside bottom of the flask. The condenser and flask have flat flanges grooved for a viton O-ring and are connected with a clamp. A 0-8 mm TeflonŽ valve is provided for vacuum.