Bathroom Sink Draining to Black Tank

Is there a floor frame member or structure in the way of running that drain to the gray tank? Assuming the kitchen shares a gray water tank with the other bath.

I would think that the sink would drain into the grey tank.

I agree, sounds like a question for Venture. Just doesn't seem like the right way to plumb it.

To which tank a particular sink drains depends on a couple of things ... where the tank is located (generally, only half-bath sinks or outside cook station sinks are routed into the black tank), and/or to maintain the overall balance of the trailer. No code violations are broken by draining a sink into a blackwater tank instead of a graywater tank. In fact, the extra soapy water will assist in flushing/breaking down/emptying the black tank. Not unlike a septic system at home, your home sinks drain into your "black tank" with no issues. As long as there are traps (and backflow preventers, in the case of outside cook stations that might be located below the unit's floodplain) at each sink, you're good to "go".

Thanks, Workerbee ... appreciate your input. As I told Jim & Lorie a couple of days ago, we could certainly have a more noticeable presence. We do monitor the sites and try to get involved if a safety issue comes up. We want the forums to not be used as warranty or service or dealer shortcuts, but instead, a place or 'forum' for owners to talk each other through small issues and cool add-ons they've added or replaced on their units and share places to visit and all that goes with camping.

I know that sometimes, when a "company" person adds commentary, the thread just goes silent. We don't want that at all. We want this to be a refuge where no one feels monitored or overseen.

Again, I personally think we have a great bunch of present and future owners on here, and really appreciate the civility and respect they show each other. Thanks again, Michael

Thank you.  Knowing that plumbing this way is intentional under certain circumstances is good to know.  Although I would have preferred to have that sink drain to a gray tank, mainly so that the black tanks fill up only when needed, I can accept that other considerations may take priority.  Also, that particular sink gets minimal usage, so it's not a big concern.