I know but it won't work on my tank since the tank is not on a high stand. The way I have it now works for me so I think I'll just keep it that way. Don't want to mess with it. It didn't even work when I had the elbow part on for some odd reason as I set it up exactly like the picture shown. Only difference is that I have the input part next to the output (input located on the opposite side of the powerheads).The curved portion of the output tube is meant to rest on the rim of the tank.
(not my drawing; from plantedtank)