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Learn everything about sump pumps for basements, including their purpose, installation costs, maintenance tips, common issues ...

Richard: Oh, I can see a leak. Yep. Kevin: ...and Richard helps a homeowner install a sump pump. All that on "Ask This Old House." Karline: Hi, Kevin. Kevin: Nice to meet you. Karline: Nice to ...

and they come with a few quirks and installation requirements. How they work: Similar to a battery-powered unit, a float switch activates the pump when water levels in your sump pit rise.

If you consider your primary sump pump as being in charge of keeping your basement or crawl space dry, you can think of a battery backup sump pump as the main pump’s insurance provider.