A ________ pump is a type of pump and motor combination used for lift stations and wet wells. It is a type of centrifugal pump.

• A. Centrifugal
• B. Vertical column
• C. End-suction
• D. Submersible

Answer: (D)

Submersible pumps are designed to operate while completely submerged in the liquid, with the motor enclosed in a waterproof housing as part of a pump-and-motor assembly. This configuration is ideal for lift stations and wet wells because it can be placed directly in the wastewater, avoiding priming issues and handling solids effectively. While centrifugal describes the pumping action, a submersible pump specifically combines the pump and motor in one sealed unit that runs under water, which is why it’s the best fit for the scenario. End-suction pumps have the motor mounted above the pump and are not designed to run submerged, and vertical column pumps are a different arrangement used in other deep-well applications, not typical for lift stations.