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A submersible pump is, as the name suggests, a type of water pump with a hermetically sealed motor close-coupled to the body of the pump. This design allows the entire pump to be submerged in the fluid it is being used to pump. The key advantage of a submersible pump over, say, a jet pump is that a submersible pump prevents pump cavitation—the formation of vapor cavities (or liquid-free “bubbles”) in a liquid, which, under high pressure, can implode and cause powerful shock waves that can damage the pump. Whereas jet pumps have to pull fluids to the surface, submersible pumps push the fluid, making them far more efficient.