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Welcome to the forum!!
RV's will have separate holding tanks. The grey tank won't empty through the black tank, but may drain out of the same termination point.
If your unit has two sewer hose hookups, then the tanks have separate drains. If there is only one hook up, then the tanks are separate but both empty into the same outlet.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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