Pool Stoppers: You can get 3 black rubber expansion stoppers, 3 sizes, 1 inch (about 2.5 cm), 1.5 inches (about 3.8 cm) and 2 inches (about 5.1 cm) for your daily use and replacement needs , to help you protect your pool in the cold winter. WIDE APPLICATIONS: This pool stopper can be used as a pipe stopper to prevent backflow and prevent entry into pipes in winter; this extension stopper also has other uses such as testing pool pressure and preventing pool flow during equipment maintenance. Stable performance: The winter pool stopper is made of rubber, which is stable and sturdy; in addition, this pool thread return stopper is also carefully crafted to resist the cold and won"t slip or shrink; it can be used for a long time. Practical: These expandable rubber plugs protect your pool plumbing by preventing access to the pipe; you only need to screw the plug into the return water; threaded pool return pipe plugs help prevent pipes from breaking. Bring convenience to your daily life: These pool skimmer plugs can be used as plumbing plugs, and threaded pool return plumbing plugs are suitable for winter ground and swimming pools; you can use them in outdoor swimming pools, kitchen and bathroom sinks, and small indoor swimming pools. Colour:black Material:rubber Package Contents: 3 x Pool Plugs Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.