To daveydd:
As I said in a former post, I would be sure that there is no one waiting for me to do this procedure - dump in the morning when no one is around waiting. My husband always had a terrible time getting the last stuff out of the hose - milk, milk, milk to get it all out so the cotter pin could be engaged, and I certainly don't want to do that (especially with a knee replacement) - it always took a long time with the stinky slinky, plus it was really messy. If all else fails, I can do this at home in my basement, but I hope to do some traveling, so need an economical way to dump my tanks. This is a reasonable solution.