Regular Gizzmo 9" Long with 1-1/2" Tapered Pipe Thread. The Regular GIZZMO skimmer freeze protection device is 9 inches long and installs in short skimmers found in both above ground and in-ground swimming pools. The Regular GIZZMO has 1-1/2" threads and features a generous bar style grip for easy handling. It is designed to absorb the expansion of winter freeze-up in swimming pool skimmers. For a professional fit; the GIZZMO can be used with teflon tape. The GIZZMO is designed for single season use.