Single black/gray drain outlet
Our last tt (2016 crossroads zinger) had two separate gray tanks with two separate drains..so, at dump station, it would be - connect / drain/ disconnect, and then do it again at the second drain.. al...
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It's the only way I have ever known. I think it depends on location of things and size of trailer. We have a front bathroom with shower and then kitchen sink. Each has it's own grey tank. I can't imagine having only 1 and having the plumbing connect the 2. I guess it would be easier but not really a big deal.
