In the first pic, the vertical line (all lines are copper wrapped in foam insulation) comes directly from the well. The irrigation system taps into the line at the yellow valve lever (barely visible) before the water goes into the house distribution plumbing. The yellow valve is to shut the irrigation system off completely for winterization. The other valve attached to the green hose is to drain whatever little water remains in the irrigation system inside the house when shut off. It’s hard to tell but the both valves tap into the same line.
The second pic is the back-flow preventer which is shut off for winterizing and compressed air is blown into the system after the cap is removed on the left to evacuate all the water from the irrigation system outside (the black vertical pipe goes to the buried valve controller).
