Features 1. Material: The winter expansion plug is made of high-quality rubber and stainless steel bolts, ensuring reliability, stability, rust resistance, durability, and resistance to breakage. 2. Function: Designed to block swimming pool pipelines after drainage, preventing water ingress and potential ice damage during freezing temperatures. 3. Easy To Use: Simply screw the plug into return and drain ports for secure sealing with minimal effort. 4. Usage: Acts as a pipe plug to seal skimmers, return lines, and cleaning lines during winterization to prevent water from entering the plumbing system. 5. Multifunctional: Suitable for pressure testing pool pipelines, leak detection procedures, or preventing water loss during maintenance. Specifications Material: Rubber Plug Sizes: 25 mm, 32 mm, 38 mm, 45 mm, 51 mm, 63 mm Colors: Black Dimensions: 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: 1 x Expansion Plug Note: Due to variations in lighting and screen settings, the actual product color may differ slightly from images. Slight dimensional differences may occur due to manual measurement.