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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 old check valve behind the wall as it is?
Will there be any issues with having two check valves on the same discharge pipe?
could there be a vacuum created between the 2 check valves that would prohibit the new pump from discharging?
any advice is much appreciated.

Re: sump pump check valve

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

Re: sump pump check valve

not a problem at all having two check valves. it won't make any difference at all, leave the old one in place.

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