Fits skimmer opening measuring: 5-3/16" x 11-3/16" Fits Hydro-Tools 8939 Widemouth Skimmer 2014 and Prior The patented Skimmer Plug™ offers an innovative, hassle-free solution for servicing and winterizing both above-ground and in-ground pool skimmers. As the first product of its kind, the Skimmer Plug™...