Bypass the check valve, don't try to replace it in place. Cut the Pex lines going to it, use a couple of 90 degree connectors (Pex or Sharkbite) to connect the two ends, add a backflow preventer at the outside fitting and you are good to go.
On Edit: I see MikenDebbie can type much faster than i and suggested the same solution (a popular one I might add).
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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