A submersible pump is a unit combining a pump and a motor to an enclosed unit, suitable for submerged installation. There are two types of submerged pumps: A submerged pump type with a submersible motor. A submerged pump with a dry motor, which is connected to the pump by a long shaft. These pumps are normally used for supply of fresh water for drinking, irrigation, and various industrial applications. Submersible pump versions The pump comes in both a single-stage and a multi-stage version (the multistage version being the most common one). The submersible pump may be connected to a riser pipes with a non-return valve, or it can also be installed connected with a flexible hose or other arrangements. The pumps are specially designed to be submerged in a liquid and are often fitted with a submersible motor which is hermetically sealed. Motor and pump are connected with a coupling, from the pump shaft to the motor shaft. Power to the motor is fed through one or more flexible watertight cable.