Convenient pool plugs for sealing pipes and serving as stoppers for pool lines, drains, or storage connections. Suitable for outdoor pools, kitchen sinks, and small indoor pools. Six sizes available (black): 25 mm, 32 mm, 38 mm, 45 mm, 51 mm, 63 mm. Practical design: These expandable rubber stoppers seal openings and prevent debris from entering the pipe. Simply screw the plug into the line to close it. Stable performance: Made from stainless steel and PVC, providing durability, cold resistance, and a secure fit that will not slip or shrink in cold conditions. Easy winterizing and maintenance: Use to protect pool pipes during winter and to close unused lines during routine maintenance. Use scenarios: - Winterizing an outdoor pool or small indoor pool by sealing skimmer, return, or other piping openings. - Sealing drains or unused lines in kitchen sinks and other small plumbing applications. - General pool plumbing maintenance where a reliable, size-specific stopper is needed. Materials and finish: stainless steel and PVC construction; black color.