Here's a diagram showing my 3 line tank setup, and a picture of the most recent one I assembled. The left pic of the stopper shows how it will be aligned in the tank. The one on the right shows how it is aligned when I put it in the tank. Once it's in I just rotate the tub so it's in the bottom front corner. To completely empty the tank I just prop up the tail a bit and I can get it emptier than with any clunk setup.