Quote:
Originally Posted by rackman
The bathroom sink drains into the Black tank.
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Yes this is very common and is usually designed that way (I don't know why but its on our plumbing prints I received from Thor).
Its not just Thor that does this as well but other motorhome manufacturers do it--only seems to be motorhomes with this design (our past 3 pull-behinds did not have this configuration though).