I think a lot of the blame on this one has to go to the dealer. Our dealer told us about this during the PDI. The good thing about this forum is that I had read about the swivel before the coach ever arrived at the dealer. I did put labels on the door that indicate which valve is for black and which is for gray. I know you can look in and see but if it is an early morning and you are tired and not thinking too straight and DW wants to take a shower and the gray tank is full and you are in a hurry ... you just might pull the wrong one.
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