Rich,
Not sure if your check valve will be of the same flavor as mine was on my 03 39QD Horizon but if it is brass then what I did was remove it, gut it of it's internals, and then replaced it back in the coach. That way you don't have to cut and couple PEX tubing etc. Mine was on the input side of the WH but some have reported them being on the output side as well. I also have a second one located behind my water service panel. Good luck.
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Rick Buddrus
03 Horizon 39QD
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