The Patented Skimmer Plug offers a simple yet revolutionary method for servicing and winterizing above ground and in ground pool skimmers. A first of its kind, the Skimmer Plug is superior to any other skimmer closure or winterizing device on the market. This Skimmer Plug is more affordable, as well as much easier to use. The Skimmer Plug fits all OEM skimmers without the need to replace the original skimmer face plate. No installation or tools required. The Skimmer Plug securely fits into the skimmer opening using our exclusive 3/4" thick Rovaseal thermo insulated layer which expands to plug and "grip" the face plate. Thus creating a 100% water-tight seal. Ice is no match for the Skimmer Plug's rigid outer plate. It provides a durable and secure layer of protection throughout the winter. Skimmer Plugs are made to be UV resistant and chemical resistant.