|VERTICAL - AXIAL FLOW - PROPELLER TYPE IMPELLER
Used for irrigation and applications where high flow and low head is required. Typically the impeller in this pump has a propeller type shape which imparts more axial than radial thrust to the liquid. See also the pump glossary.
For parts diagram see Hydraulic Institute
For an example see: http://www.mwicorp.com/pump_lineshaft.htm