Hi Kodak, sorry about the wording on that. Our 2" drain pipe goes to the skimmer compartment in the sump. It isn't plumbed directly into the skimmer. The 1" pipe comes off that pipe and goes to the refugium compartment. Here is a picture that might show it a little better. (This was taken before we paited the pipes black). Hopefully you are able to see it, but the 2" pipe just kind of drops into that compartment. The skimmer is able to pick up water with the pump it comes with, and we aimed the skimmer outflow pipe towards the return pump, so the skimmed water gets pushed out into the return.