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    Re: sump pump check valve

    the new combo pump I am going to install is a Basement Watchdog model BW4000
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    622

    sump pump check valve

    I am replacing a PRIMARY sump pump with a combo primary/baCKUP UNIT.
    The old unit has a check valve behind a wall.....
    the new unit has a check valve on the pump.
    questions.... can I leave the...
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