Hi Jon,
Quick question for you. On our 311FS where the water connects it appears that there is some sort of a flush, but I do not know if it is for the black tank or something else. I tried to use it, but when I connected the hose and turned it on water came from underneath the coach. I was hoping this was a black tank flush, but it appears it may not be. Our 311FS gots into the shop this Tuesday to get all the small items fixed and hopefully they will address the wall that is bowed out.
Thanks,

Jeff & Teri