This pump is designed for 2" and larger water wells, cisterns or even pumping out of a pond. Uses air and air pressure to lift the water to the surface and out the discharge hose. This high quality air pump has zero moving parts and is made out of 304 Stainless steel so will last virtually forever. These pumps work on a submergence principle, which is calculated based on the total depth of the well (where the pump intake is set) versus the water column in the well itself. The greater the submergence, the higher the discharge rate. Smaller and larger sizes are available. Works with our wind driven & electric aeration systems.