Thanks Shot-N-Az. That makes perfect sense. When I was trying the other day I think the main problem I may have had was that I also had the water connected to the rig. So when adding chems I should have "fill tank" open and when winterizing I should have "city water" on? Don't know about your Newmar but our Baystar has the Tank/city valve in one bay and the pump and winterizing hose in the next. Wish it was all in the same bay. Found the valves for the water heater under the sink in the rig. May just have to spend the $100 to take it down and let a tech show me how. Our Coachmen was a breeze as everythoing was in one hook up with labeled valves. Thanks for your help.