i have a leak going down to the wate tank..ran water through it from the toilet ..the butterfly valve there is spewing fairly well...im not sure i know where to begin or get parts for this... help with any suggestions ?............

Oh yeah. Not easy to get to! All of the black and gray water valves are Thetford, and still available. I'm not sure what you mean by "butterfly valve" though. Are you talking about the toilet valve under the toilet or the slide valve that is pulled to drain the tank??