As
@lostinfla posted, I replaced the wet bay shower with the same faucets. For the black tank rinse I wanted to use the water source before it entered the house filters.
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The hookup has another back flo attachment, the the coach has its own back flo and air gap unit already in place and the rinse hose is never left attached to the clean out so I’m satisfied that this safer than if I were running a separate hose to the water source each time I back flushed with the park water source.