DKRITTER Posted January 5, 2017 Report Share Posted January 5, 2017 We use our 5th wheel most of the year and stay in a variety of places but mostly RV parks with full hookups. For those times that we don't have full hookups I use a twist on valve and combine the 2 grey tanks since the shower fills up a lot faster than the galley. So now for the nasty question; I've looked around and haven't seen it asked but I wondered how bad of an idea it would be to combine the grey and the black tank to make what would be one large tank? We have septic at the house and everything goes into it. When we are at a full hookup park all of it ultimately goes to the same place. I know I am probably going to get pummeled for even asking the question, but would someone with more knowledge explain this to me (us). Link to comment Share on other sites More sharing options...
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