Thanks for the idea. I am at work, so I can't check until later for sure. I don't recollect that being the case, but since the pump and valves are in a nook under the bathroom vanity, I have to admit I have not given it a close inspection. But I will double check when I get home. Another reason I am thinking that might not be the case is my Greyhawk has an "Utility Center" panel on the outside of the coach that has two valves with 3 settings each. One of the settings is for winterization. And when in that setting, the manual says to just put a hose from the fresh water inlet into the bottle of anti-freeze. So I think the valve you are referring to might be built into the combination valves in the Utility Center.
I still have the HWH in bypass. Part of my plan to do one step at time...only problem is I failed at step two!
I figured I would get the faucets flowing before introducing another component. Is it a problem that I still have the bypass in?
Is there any other hints? Like should I leave all the faucets open...one or none?