What is your Model and FloorPlan number?
is it a mid-bath?
also, if you move your question to the iRV2.com THOR discussion area, you might get some more replies from TUSCANY owners...
question: does the 'black' water come out of the smaller exit pipe(1 1/2"), or the larger one(3")?
Black tank plumbing is typically the larger 3" and
Gray tank plumbing exit is usually the smaller 1 1/2"
as someone else said, they may just have mis-labled Handles
if you truly have the black water going into the gray water tank, is anything going into/coming out of the black water tank?
typically the factories set the mid bath commode directly over the Black tank, as this allows the waste to drop directly into it. Having the commode empty into the gray tank would seem to be a 'enormous' effort for the factory, if by 'accident'. I don't see how that would be even possible.
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