Dennis M M wrote:
If I am hooked up with the gray tanks open I use the support, otherwise I don't bother.
The one time I left the gray tank open with a support I had the "Stinky RV" of the useless chemical ads.
Closing the valve fixed it (Sewer gas backing up the hose)
With no support and a dip of at least 3 inches along the line the hose would have formed a water trap and prevented that from happening.
In fact on my #2 Gray tank.. the 3/4 inch hose does just that.
To the Original Poster:
At the dump side I dump and drain, rinse and leave, All in about the time it takes to type this message (Ok, bit longer I type fast).
At the campsite I ... am not going to move for a couple of years, So I do not want the waste water sitting in the hose all that time and working on the plastic tryign to make holes.
I am not sure,, but this could be the very site where I once left the valve open (it was in 2011 after all)
But since you wanted to know the diference..
How long you are on the site, Minutes v/s relative long time.