Simple, reliable inertial pump that provides a cost effective sampling option for groundwater monitoring. The Pump consists of a riser tube fitted with a one-way foot valve. It can be easily operated manually, or by using a surface pumping mechanism. The tubing and foot valves come in various sizes suitable for varying well diameters and sampling applications. Effective to depths of 200+ ft (60+ m) in 0.4″ – 6″ ID wells (12 mm – 150 mm).