Holds vacuum of 29 in.Hg (73.7cm) for 24 hours Clear polycarbonate construction for corrosion resistance, enhanced visibility, easy cleaning Molded-in handles allow easy transport and removal of top half Neoprene O-ring requires no vacuum grease at room temperature; under cold conditions, grease ensures a tight seal to 0°C Polypropylene stopcock with PTFE plug easily turns to minimize disturbance to contents