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When you need to tie a second drain line into an existing 3" waste run, a wye fitting gives you the smooth-angle branch that straight tees can't. Valterra's 3" Hub Wye DWV fitting is built for exactly that job in RV or trailer drain-waste-vent plumbing.
It's sized for standard 3" NPT hub connections, so it mates up with common DWV pipe and fittings already used in holding tank and drain plumbing runs.
A useful fitting to have on hand for holding tank plumbing repairs or modifications.
