OVERHUNG IMPELLER, CLOSE COUPLED, SINGLE STAGE, END SUCTION
(CANNED MOTOR PUMP)
This is a sealless volute type pump and is used for fluids that are corrosif, volatile, radioactive and toxic. This type of pump is used where leaks, even the smallest, cannot be tolerated.
For parts diagram see Hydraulic Institute
For an example see: http://www.nikkisopumpsamerica.com/nikkisoamerica/products/nonseal.html