Nalgene 6131-0020 Repairable Hand Vacuum Pump without Gauge, PVC, 36cc/Stroke Pumping rate: 36cc/stroke; positive pressure at exhaust port: 7psig (.48 bar) Material: polyvinyl chloride Nozzle fits standard 1/4 inch I.D. tubing; comes with two feet of clear plastic tubing; vacuum can be released without disconnecting pump from the line Pump can quickly attain and hold a vacuum of 25 inches Hg; one-hand operation; adjustable vacuum release rate Comes without a vacuum gauge; ideal for field or lab use