This is the Original Gizzmo. It is designed to absorb the expansion of winter freeze-up in swimming pool skimmers. The Gizzmo is 9 inches long and installs in short skimmers found on inground swimming pools. The Gizzmo has 1.5 inch threads and features a generous bar-style grip for easy handling. For a professional fit, the Gizzmo can be used with teflon tape. Teflon tape is a very thin, white tape used to wrap the threaded ends of pipes to improve the water tightness of a joint. The Gizzmo is designed for single season use. Please remember to recycle this product.