The Skimmer Plug by Simpooltec offers a simple and proven method of winterizing your aboveground pool skimmer for the off-season, without draining water from the pool, and without having to buy a new skimmer faceplate. The Skimmer Plug is made to fit the inside of your existing aboveground or inground skimmer faceplate perfectly, creating a water-tight seal that effectively keeps your skimmer dry all winter long, preventing freeze damage without draining the pool water. The Skimmer Plug's patent-pending Rovaseal thermo-insulated layer tightly grips and plugs off the faceplate.Features: Saves time and money – no more draining pool water or replacing faceplate Easy to install 100% Air-tight seal with Rovaseal technology Freeze and shatter-proof closed cell skimmer plug Impervious to mold, mildew, bacteria and superior chemical and oil resistance Specifications: Min Height 5-1/2" Max Height 5-5/8" Min Width 5-3/16" Max Width 5-15/16"