Hand Pump w/Pressure and Vacuum Capabilities
by United Scientific

Consisting of a seamless metal cylinder, a piston and two “one-way” valves, this hand pump is capable of creating both pressure and a vacuum, depending on which of the valves is being used. The contoured plastic handle allows for a solid grip when pumping, making it easier to push and pull the pistol along the length of the cylinder. The valve on the side generates pressure, while the one on the end opposite the handle creates vacuum. The pump itself measures 14x4x1.25″, and includes a 12″ of hose for experiments.

Pressure:
The maximum change of pressure in 30min is no greater than 9.8×10²Pa, when an initial pressure of 2.9×10⁵Pa (3kgf/cm²) is used.

Volume:
The maximum change of pressure in 30min is no greater than 2.6×10²Pa for an initial pressure of 6.7×10³PA (50mmHg).