Thanks for adding me to honorary plumbers-crack membership!
It's a temporary setup (until I look more closely at what's really disabling the back-pressure valve) - which allows me to analyze the valve in my own sweet time without being super frustrated by the leaks.
Speaking of leaks, I had expected a leak when I first turned it on, but it was water tight from the start.
The galvanized pipes are a bit crudded up inside though ...