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Holding tank in 1973 Swinger RV Brenda 6-16-08  
We have drained our holding tank or at least it says we have, and then we have our fresh water backing up into the bathroom, is there another drain somewhere?
We purchased the RV from a widow who could not give us a lot of info, as it was her hubby who looked after everything.
Brenda in smalltown, Alberta
Re: Holding tank in 1973 Swinger RV Dave 11-13-08  
You probably drained the "Black tank".

There are two tanks Black = toilet and gray = sinks and shower

At the drain you should have two valves a large one for the black tank and a smaller one for the gray tank.
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