This shows the rear attach point of the upper wing to the cabane. The landing wires have tape on them where they were removed to make room to get the tank out (and back in). In the right hand side of the picture is the feed from the upper tank to the fuel system or smoke system. It was connected to the fuel system when I bought the plane. I used it once that way and decided I'd like it better as a smoke tank; so, I changed the connection over to the smoke pump.