Label: Yes Material: Rubber Size: 25mm, 32mm, 38mm, 45mm, 51mm, 63mm Type: Expansion Plug Color: Black The winter expansion plugs are made of high-quality rubber material with stainless steel screw bolts, providing reliable and stable performance. The design is rust-resistant, durable, and not prone to breaking. This pool winterizing plug is designed to seal swimming pool pipes after draining, helping prevent water entry and potential freeze damage. Easy to use—simply screw the plug into return and drain inlets for convenient installation with minimal effort. Ideal for use as a pipe plug to seal skimmers, returns, and cleaner lines during winter months to keep water out of the plumbing system. Multifunctional use: Can also be used for pressure testing pool lines or detecting leaks, as well as stopping water flow from the pool when needed. Package Includes: 1 x Expansion Plug