The Skim Saver Lid'L Seal is a patented winterizing product that saves you time, money and water. It's designed to protect your pool's skimmer from costly damage due to expanding, freezing water - while the unique built-in ridge protects the pool wall opening from corrosion during the off-season. Lid'L Seal also saves thousands of gallons of water a year, because there's no longer a need to drain your pool water below the skimmer level. And Lid'L Seal Skimmer Closures are simple to use. Just replace your existing Skimmer faceplate with the patented SkimSaver faceplate and snap in the flush-mount Lid for a watertight seal, all winter long. Skimmer Closure includes Skimmer Face Plate & Snap-on Lid, gaskets not included.