I own a 2009 29" Holiday Rambler Savoy SL. I have one dump valve that I can open the black water valve, empty it and then open the grey water valve and empty that one. I have replaced the valves 3 tim...
I would not try the two-connection solution you suggest - It does not eliminate the leakage problem and makes you have to disconnect the not-yet-rinsed stinky slinky from the black tank connector, which has to be great fun-NOT.
I have an additional valve installed just before the stinky slinky connection which gives the extra protection I need to prevent situations like the one you explained.
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