Description: Material: The winter expansion plugs are made of high quality rubber material, with stainless steel screw bolts, reliable, stable, anti rust, not easy to break, durable and long lasting. Function: Pool Winterizing Plug is designed to plug your swimming pool pipes after they have been drained, avoiding water entering and causing freeze. Easy to Use: Just screw the plugs into all return and drain inlets, convenient to handle and use, need no much efforts. Application: Used as pipe plugs, to plug skimmers, returns and cleaner lines to prevent water from entering the pipes during winter. Multifunction: The plug can also be used for pressure testing pool lines or other methods of leaking detection, or stopping water from the pool. Specification: Material: Rubber Color: Black Type: Expansion Plug Size Chart: 25cm/9.84inch 38cm/14.96inch 51mm/2.01inch 63mm/2.48inch Package Includes: 1 Piece Expansion Plug(6 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!