http://williamwareagency.com/forsale/stanvan/tank88.jpg
The holding tank vents to a nipple on the fill port that the big hose
connects to.
It cannot overflow into your van.
The sink drain has no vent its just gravity flow to the under van drain
location.

Stan

On Sat, 7 Dec 2002 21:47:27 EST John Shattuck <JShattuck3@AOL.COM>
writes:
> Hi Everyone,  Could someone tell me how and where the sink drain
> holding tank
> is vented.
>
>
> Thanks,
> Chadwyck
>
>

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