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Mine has one black water pipe and one gray water pipe for two tanks. I bought a Y as well, but its about more trouble than its worth. While set up, if i dump the gray, then no problems. However, if i dump the black, then i have to back flush the black tank because there's nothing to rinse my dump hose that goes from the black pipe to the Y. When i'm at a dump station, i just do the black, then move the hose to the gray like normal. My two pipes are only about 2 ft apart. I've considered plumbing the gray into the black, but at this point it hasn't been that big of a deal on the short trips i have to take. I usually only have to dump once.
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