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Old 11-25-2019, 06:39 AM   #16
UAHaerospace
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while this discussion comes up on many different RV forums, having a bath sink drain into the 'black' tank is not any issue, and is done this way at most any RV manufacturer and for many different models/floor plans for several reasons.

The most common reason is that the floorplan has the sink and toilet so close to each other, and on the same side of the RV, that it makes little sense to try to plumb drain pipe 'across' the RV just to have it empty into the gray tank. It's not just about 'money', it's about the reality of running plumbing pipe that must drain 'downhill' to it's tank.

Another reason is that while most of us would think that it's only 'proper' that gray water empty into a gray tank, and 'black' water empty into a black tank, there is no 'law' that requires gray water to 'only' empty into a gray tank - after all, they are both simply holding tanks. Manufacturers also realize that while we may think that we should have two holding tanks of the same size, and that's generally how it goes, most folks also generally fill the gray tank way before they fill the black tank. Having a bath sink also drain into the black tank simply gives the owner more 'time' before the gray tank is full.
Most of us empty both tanks at the same time, so it makes sense.

There is no 'right or wrong' to this equation. Both tanks are for holding waste.
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