I have a hayward sp-1080-E basket. Not sure what the skimmer model number is, but there is a pipe that comes up through the basket. If you look up the skimmer basket model number, you can get an idea of what size pipe comes up through it. anyway, this pipe was plugged with a rubber stopper when I first opened the pool and the store near my house said most likely (without looking at it) this pipe goes to nothing. They said most contractors stock a double line skimmer?!?! and that I should just plug it up again. If this is the case, then I think I could just get a similarly sized basket without the hole in it for that pipe and then just cut it below the basket line and cap it. What do you think? How could I even be sure what this pipe does? The pool seems pretty basic. 1 return pipe, for 2 returns, 1 suction line that comes from the bottom drain and the skimmer (not sure on that one). Oh, also, when I opened the pool and I took the rubber stopper out of the pipe coming up through the basket, it had some type of antifreeze because a chemical like fluid came out (the color of red) with some bubbles. Lastly, why would I have a return jet below the skimmer that has a piece that looks like the liner in it? Is this not a cap at all, and maybe more likely a connection that leads to the mystery pipe? some kind of inlet that feeds the skimmer in some way? If the pool wasn't green, I would take a picture of this thing that look like a capped return. It is roughly 6 inches to a foot below the skimmer entrance.