Originally Posted by Wet_Boots
It sounds like an interesting arrangement - to use the system mainline as a pressure tank.
I know it was installed by the only Toro dealer in the area. They did and still do a ton of installs. I don't think they're hacks by any means. I'm certain there is no pressure tank though.
I can account for only 1/2 of the valves.
I like a challenge, but maybe I should run from this one.