This is a top down. On the right side of the image you have the emergency (top pipe at surface) and the full siphon under water below it. The cross pipe is the return from the sump. The open pipe above water is a tank pass through so if I need power heads, I can pass the cords through that to under the tank to plug in. (Requirement from wifey was no visible cords in the tank or coming out of the tank).Hi, i am setting up a Herbie style overflow could send me pics of how you have it setup ? Appreciate it