That wouldn't possibly be the backflow preventer that is part of the black tank flush system? I also am not familiar with your rig, but it sure sounds like that is what it is. If you could trace at least one of the lines to the fitting that is labelled as the black tank flush, that would prove it.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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