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**chuckster57** · 07-24-2018, 06:50 PM

The outlet of the black tank should be 3” diameter. If there isn’t any turns in the drain line it should come out if you fill the tank with fresh water.

Otherwise, the blade valve should be right at the outlet of the tank and you will only need to dis assemble it. Clean water rinse is your friend.

I would have a “clear piece” attached to the outlet so you can see if it comes out when you rinse the tank.

If you take the valve apart, note the brand as they each have specific seals that should be replaced.

07-24-2018, 06:50 PM	#6
chuckster57 Site Team Join Date: Jul 2014 Location: Modesto Posts: 20,317	The outlet of the black tank should be 3” diameter. If there isn’t any turns in the drain line it should come out if you fill the tank with fresh water. Otherwise, the blade valve should be right at the outlet of the tank and you will only need to dis assemble it. Clean water rinse is your friend. I would have a “clear piece” attached to the outlet so you can see if it comes out when you rinse the tank. If you take the valve apart, note the brand as they each have specific seals that should be replaced. __________________ 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.