backup power for sump pump

[MasterPlumbersKeymaster]

I have an existing residential sump pump in good working condition. The question: Is there a cost effective way of installing a backup power to the pump if the AC power is out for few hours. Is there a unit out there where one end plug to the sump pump outlet and the other end plug into the regular AC socket. Hence when AC power is out, the unit will automatically turn on and supply DC to the sump pump?

[SylvanLMPParticipant]

What your looking for is manufactured by Stevens pump corporation

[Author]

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