Are you sure there is a gasket where the hose screws into the connection?
You will find MANY opinions so far as "sanitizing" the black tank. Why do you feel a need to sanitize the black tank.........is someone going to drink from it?!
We are full timers and have been for almost 6 years. We use nothing but PLENTY of water and do not dump until the tank reaches about 3/4 full or when it "burps". We flush the tank every 2-3 dumps to remove anything that has not totally dissolved while in the tank. BTW, we do not have any problems with odor by doing it this way either. We have one of those "tornado" devices mounted on the black tank vent on the roof.
Works for us.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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