Quick answer

A submersible pump has a hermetically sealed motor joined closely to the pump body, so the whole unit runs completely submerged in the fluid it pumps. Rather than sucking liquid up like a surface pump, it pushes fluid to the surface, which makes it efficient for deep-water extraction, removes the need for priming and protects against cavitation.

A submersible pump is a mechanical device featuring a hermetically sealed motor tightly to the pump body, allowing the entire unit to operate completely submerged in the fluid it pumps. Instead of pulling or suctioning liquid from above like a surface pump, it pushes fluid upward to the surface, making it exceptionally efficient for deep-water extraction. 

Because it operates underwater, it eliminates the need for manual priming and is naturally protected against cavitation.

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