Features 1. x x Material: x x The winter expansion plug is made of rubber and stainless steel bolts, providing reliability, stability, rust resistance, and durability. It is not easily broken. 2. x x Function: x x This antifreeze plug is designed to block swimming pool pipelines after draining, preventing water from entering and causing ice formation. 3. x x Ease of Use: x x Simply screw the plug into all return and drain ports for easy operation. 4. x x Application: x x Use the plug to block skimmers, return pipes, and cleaning pipes, preventing water from entering the pipes during winter. 5. x x Multifunctionality: x x This plug can also be used for pressure testing pool pipelines, leak detection, or to prevent pool water from flowing out. Specification x x x Material: x x Rubber x x x Plug Sizes: x x 25 mm, 32 mm, 38 mm, 45 mm, 51 mm, 63 mm x x x Color: x x Black x x x Sizes: x x 4 x 3 x 3 cm, 4 x 4 x 3 cm, 5 x 4 x 3 cm, 6 x 4 x 4 cm, 6 x 5 x 4 cm, 7 x 6 x 5 cm x x x Weights: x x 31 g, 48 g, 65 g, 83 g, 100 g, 120 g Package Includes: x 1x Expansion Plug Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store