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, stable performance. Resistant to rust and breakage, these plugs are durable and long-lasting. Designed for pool winterizing, the plug is used to seal swimming pool pipes after draining to prevent water entry and freezing damage. Easy to use—simply screw the plugs into return and drain inlets for convenient installation with minimal effort. Ideal for use as pipe plugs to seal skimmers, returns, and cleaner lines during winter months to keep water out of the plumbing system. Multifunctional design allows use in pressure testing pool lines or detecting leaks, as well as stopping water flow from the pool when needed. Package Includes: 1 x Expansion Plug