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The bathroom sink and the shower use the same GREY water tank. The sink does NOT drain into the black tank on a 2019 Compass like most others. (That's what we own.) I was really surprised when I poured a bucket of water into the bathroom sink and it backed up into the shower. It should go to the black tank to help with enough water. But they don't. (At least on our rig.)
If the valves are pushed in, they are closed for dumping purposes. It should not matter if they're in or not for the backup problem from the the sink to the shower. The water flows directly to the holding tanks with no valves in between.
The black tank location may vary by model - but on our 23TR, it's on the driver's side. No extra cross pipe.
When I dump, I connect the stinky slinky, pull the black tank and let it drain. When done, I then pull both grey tank valves and then the main grey tank valve and flush as much of the black tank waste out as possible. Then I turn on the sani flush and let that run until the waste runs clear. Some people shut the black tank valve and let the tank fill before dumping. I will be trying that at some point. Until now, I have not done that.
Hope that helps.
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