I want to install a Hayward through wall skimmer and have read all about the installation and sounds pretty easy. Here's my question - what do I do with the existing outlet that my over the wall skimmer connects to? Do I (somehow) close this off - or do I also plumb it into the new skimmer line (or pump?)? My pool is a 15 x 48 Intex above ground metal frame pool (with the blue liner) and the fittings in the liner are rubber hose type (not sure what to call them), but not hard lines (PVC).