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. Function: Pool winterizing plug is designed to seal swimming pool pipes after they have been drained, preventing water entry and potential freeze damage. Easy to Use: Simply screw the plugs into return and drain inlets for convenient installation with minimal effort. Application: Used as pipe plugs to seal skimmers, returns, and cleaner lines during winter months to prevent water from entering the plumbing system. Multifunctional: These plugs 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