1. We have a 1976 Aristocrat trailer and we have a clogged water line The sink drains but comes up through the shower drain. The toilet flushes fine. We have tried using vinegar and baking soda and a commercial drain opener and still no luck. We cannot find a plumbing schematic on line that shows our trailer on it. Our model is a M-17.

  2. If I read between the lines… the sink to the shower is clear. The toilet flushes fine, which it would because it has a direct pipe to the black tank. But the shower builds up water and that is the problem. Is your shower draining at all? Or is everything draining fairly well, but the sink drain gets into the shower. It sounds like the shower is not draining based on what you wrote. Can you confirm?

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