Large BHO Vacuum Purge Kit w/ Hand Pump Kit comes complete with a scientific grade vacuum purge chamber. Connects to any convenient vacuum source or a mechanical pump. Will withstand full vacuum. Shatterproof vacuum purge chamber will store and protect sensitive products. Will hold a full vacuum (29.9" Hg 75.9cm) at room temperature for 24 hours and remain airtight even if not under vacuum. Polypropylene stopcock with PTFE plug accepts 6.4mm (1/4") I.D. tubing and allows a controlled entrance of air preventing unnecessary turbulence. Flat-top clear polycarbonate dome top with large ribbed knob maximizes interior clearances and provides an average of 13% greater interior volume over standard hemispherical domes. A neoprene O-ring assures a tight seal down to 0 degrees Celsius without the need for grease (ring will not be harmed if grease is used.) Includes a 0.32cm (1/8") thick perforated plate. White polypropylene bottom. Can support High Heat Ceramic Plates Hand pump attains and holds a vacuum of 27" Hg with just a few squeezes of the handle. Comes equipped with a gauge to monitor vacuum in both centimeters and inches of mercury. Has a pumping rate of 15 ml per stroke and gives 3 psi positive pressure at outlet point. Nozzle fits standard 1/4" tubing and includes 2 ft. of tubing. Comes will Full Instructions.