Features: Make of plastic, the skimmer winter plug withstands harsh winter conditions. With the skimmer winterizer tube, there is none need to drain your pool under your skimmer and refill your pool every year during the winter. It effectively absorbs the expansion caused by freezing temperatures during winter, which help prevent the skimmer housing from cracking. Usages: Simply screws it into place after verifying that the plumbing systems is completely drain to ensuring greatfunctionality. This pool skimmer plug fit most on ground skimmer and works with 1/2inch and 2inch tapered pipe thread. Specifications: Component: Plastic Type: 1pc Small/2pcs Small/1pc Small and 1Pc Large Small Size: about 8x26cm/3.15x10.24inch Large Size: about 8x43.50cm/3.15x17.13inch Package Includes: 1pc Small Pool Skimmer Plug/2pcs Small Pool Skimmer Plug/1pc Small and 1Pc Large Pool Skimmer Plug note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.