Protect the pipeline: The winterization plug 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 winterization 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. Wide range of applications: Suitable for home garden swimming pools, swimming pools, etc. It can be used as a pipe plug to seal skimmers, return pipes and detergent pipes. High quality material: The expansion plugs are made of plastic, meet standard specifications and are scalable to ensure strict sealing performance and avoid leakage.