Quote:
Originally Posted by JJ_theRV_guy
If thor ran grey tank lines to black tank..then unit was plumbed wrong and should be fixed to have grey and black tanks separated. It is a hazard if black tank has the ability to vent back through any sinks.
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Then Thor has plumbed just about
every motorhome they built wrong as they all have the bathroom sink going to the black tank. Its even worse because if you get the
engineering drawings from them you discover that they are designed that way from the start.