This hand-operated polyvinyl chloride vacuum pump has a new handle design which makes it more durable. The pump can quickly attain and hold a vacuum of 25 inches (635mm) Hg. Vacuum trigger release requires only one hand to operate and releases vacuum with the touch of an index finger. Adjustable vacuum release rate is controlled by a trigger on the pump. This pump has a pumping rate of 15cc/stroke and 3psig (.21 bar) positive pressure at the exhaust port. Full blank port pressure is obtained with only two strokes. The pump has a removable cover on the exhaust port and a trigger to release vacuum without disconnecting pump from the line. Comes without a vacuum gauge. Ideal for field or lab use. The nozzle fits standard 1/4 inch I.D. tubing and it is supplied with a two-foot length of clear plastic tubing. Material: polyvinyl chloride body. Pumping rate: 15cc/stroke. Positive pressure at exhaust port: 3psig (.21 bar). Fits 1/4 inch I.D. tubing. Nalgene #: 6131-0010.