Borehole pumps

Description borehole pump:
A multistage submersible pump with a diameter slightly smaller than the borehole is powered by a special submersible motor of approximate same diameter as the pump. The pump-motor combination is attached to the discharge pipe and lowered into the borehole/ well, upto a depth where the unit is sure to be submerged at all times. 

To pump water from wells which are to deep to use a dry mounted pump.