Features 1. **Material:** The winter expansion plug is made of high-quality rubber and stainless steel bolts, providing reliability, stability, rust resistance, and durability. It is not easily broken. 2. **Function:** This antifreeze plug is designed to block swimming pool pipelines after draining, preventing water from entering and causing ice formation. 3. **Ease of Use:** Simply screw the plug into all return and drain ports for easy operation. 4. **Application:** Use the plug to block skimmers, return pipes, and cleaning pipes, preventing water from entering the pipes during winter. 5. **Multifunctionality:** This plug can also be used for pressure testing pool pipelines, leak detection, or to prevent pool water from flowing out. Specification * **Material:** Rubber * **Plug Sizes:** 25 mm, 32 mm, 38 mm, 45 mm, 51 mm, 63 mm * **Color:** Black * **Sizes:** 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 * **Weights:** 31 g, 48 g, 65 g, 83 g, 100 g, 120 g Package Includes: * 1x Expansion Plug