Skimmer Plug for Hydro Tools 8939 Skimmer Note: This model fits the 2014 & Prior 8939 Hydro-tools widemouth skimmer. Keep your skimmer dry all winter long with the Skimmer Plug for Hydrotools 8939 Widemouth Skimmer. NO TOOLS REQUIRED!Just press plug in place Rovaseal insulating techmology. Keeps skimmer dry all winter long. Dimensions: 113/16 " x 53/16" **