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Submersible pumps, also known as Electric Submersible Pumps (ESP) have hermetically sealed, electric motors to enable them to be completely immersed in the fluid being pumped. They are of centrifugal design and therefore are very efficient, requiring less energy for moving water into the pump than other designs of pump. Narrow submersible pumps are known as borehole pumps which are designed for extracting water from narrow holes drilled into the ground as narrow as 4”.