This is the Super Gizmo. It is designed to absorb the expansion of winter freeze-up in swimming pool skimmers. The Super Gizmo is 16 in. long and installs in big deep skimmers of most in-ground swimming pools. The Super Gizmo has both 1 1/2 and 2 in. threads and features a generous bar style handle. The double threads offer convenience by accommodating most skimmers with one item. For a professional fit, the Gizmo 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 Gizmo is designed for single season use. Please remember to recycle this product.