This polypropylene aspirator pump attaches to any standard lab faucet to provide maximum free air pumping capacity of 11.5 liters per minute at a water flow rate of 6.5 liters per minute. Operates efficiently with water pressures as low as 7.5psig (.517 bar) for minimum water consumption. The ultimate vacuum is obtained at 28-1/2 inches (723.9 mm) Hg. Pump is supplied with an integral check valve 3/8 inch NPT connecting thread and 4.75 inch length of polyethylene tubing for insertion in discharge end. Material: polypropylene pump with integral check valve and NPT connecting thread and polyethylene tubing. Maximum free air pumping capacity: 11.5L/min. Water flow rate: 6.5L/min. Nalgene #: 6140-0010.