Rich,
Just a suggestion. I have a separate gray hose I use for the flush. Not that I don't trust a check valve - but I don't trust a check valve - and I sure don't want any of that backsplash from the black flush coming back into my potable hose.
If you had the gray hose, you could even leave it hooked up to the docking station and just disconnect it at the bib when you're not using it.
Brad
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