Widely Applied Winterizing Plug: the pool outlet plug can be used for returning and avoid entering tubes in winter, also great for pool equipment maintenance testingSwimming Pool Plugs: you can get 4 pieces of black pool plugs in 4 sizes, including 1 inch, 1.25 inches, 1.5 inches and 2 inches, considerate in combination to meet your daily use and replacement requirements, providing your swimming pool with protection in winterHeavy Duty Rubber Plugs for Pool: the skimmer plug is made of durable rubber and steel materials, which won't slide or shrink after long time usePractical and Useful: the pool plugs for above ground pool can prevent water flow from entering tubes, avoid water flow freezing and breaking the tubes in winter; Just screw the pool plugs into backwaters to prevent your pool from running into serious destructionMany Uses: the pool skimmer plug can be applied as a tube plug, which can return and prevent water flow from entering tubes; What's more, this skimmer plug can also serve for testing the pressure of pool, leak detection and preventing flow from the pool during equipment maintenanceColour: BlackMaterial: RubberPackage Contents:4 x Pool PlugOnly the above package content, other products are not included.Note: Light reflection 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.