Function: These expansion plugs are designed to winterize your swimming pool, helping protect it from harsh winter conditions and potential damage. The tapered plugs, featuring a rubber coating, can be used to seal or block holes, pipes, drains, sinks, tanks, and other fixtures in your pool, kitchen, bathroom, or yard. Ideal for use as pipe plugs to seal skimmers, returns, and cleaner lines to help prevent water from entering the plumbing system during winter months. These expansion plugs can also be used for pressure testing pool lines, leak detection methods, or stopping water flow during equipment maintenance or repairs. and of high quality. Material: Rubber + Stainless Steel Color: Black Package Contents: 6 x Pool Plug (2 x 25mm, 2 x 38mm, 2 x 51mm) Note: The package includes only the items listed above; other products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual color. Measurement may vary by up to +/- 1-3cm.