I have 2 flat nylon hoses, (reel storage type) and one vynil 25 footer and one 10 footer and one 6 footer that I use off of a "Y" that is wrapped in stripes with black tape. This one goes to my black tank flush valve. The "Y" has on-off ball valve in it, so that when I back flush, I turn off the fresh water side and turn on the balck tank flush side. Works for me!
