Protect the pipeline: The winterization cap can block the water return pipe to prevent rainwater from entering the freezer and causing the pipeline to break, and protect the swimming pool from damage. With rubber ring: To ensure sealing performance, the 5pcs winter plugs can meet different requirements and are suitable for massage bathtub accessories, swimming pool accessories and SPA accessories.< /p> Easy to install and use: Directly block the pipe return port, no need to use additional auxiliary fasteners, simple operation only takes a few minutes. High quality material: Pool winter expansion plugs are made of plastic, conform to standard specifications and are scalable to ensure strict sealing performance and prevent leakage. Wide range of applications: suitable for home garden swimming pools, swimming pools, etc. The skimmer plug can be used as a pipe plug to seal oil skimmers, return pipes and cleaning agent pipes become.