It is a 2005 Six-Pac D850. Sorry no pics of the drain, but assure you it only has one tank, and one drain valve.
I added the Make and Model to my signature, but profile has info and pictures in there, unless I have to select something in preference for others to see it?????
This has just happened this one time, the last time we used it. Probably been on 4 or 5 trips total and never happened before. I have only camped once where there was a dump station, so I know I have traveled home at least 3 times from this lake with waste water in tank. Thanks.
