I'm new to RV'ing (and campers in general). Mine was delivered last week and I have been learning lots. I went to hook up my sewer tube and empty the tanks two days ago. It was then that I learned that the RV had been delivered with the tank valves OPEN! I really wish my delivery guy had explained that little detail to me. Don't feel too bad for me, I realized it BEFORE I took of the cap. It was still a messy job getting the tube hooked up.