The incredible Ultra GIZZMO skimmer freeze protection device uses the unique sealed air cushion of the GIZZMO combined with a built in blowout tube.The choice of 1-1/2" or 2" tapered pipe threads allows the Ultra to accomodate almost all skimmers. The integral blowout tube provides the option to use the Ultra GIZZMO as a suction line extension to easily clear the lines without lowering the water level in the pool. The Ultra GIZZMO features double threads with rubber gaskets; a blowout tube with a rugged cap and generous lug style grips around the top for easy handling and convenience. For a professional fit; the GIZZMO can be used with teflon tape. The GIZZMO is designed for single season use.