Fits various widemouth aboveground skimmers, including Hayward SP1091WM, Kokido K002WBX, Poolstyle PS002, Waterway Flo-Pro II Widemouth and more. Keep you skimmer dry all winter long without draining your pool. No need to replace the faceplate, simply press the plug in to close off the skimmer. Simple, yet revolutionary method for servicing and winterizing above-ground pool skimmers. Exclusive Rovaseal(tm) thermo-insulated material creates the ultimate air-tight seal. Rovaseal high density foam offers the most advanced thermo-elastic water barrier available that remains chemical, temperature and u.v. resistant, ensuring a water-tight seal. Rigid outer plate provides a durable, secure layer of protection. No tools required. Preparing your skimmer for winter or servicing has never been easier. Simply pull the plug off to re-open. Reusable-year after-year.