Protect the pipeline: Winterizing cap can block the water return pipe to prevent rainwater from entering freezing and causing pipeline rupture, and protect the swimming pool from damage. With rubber ring: to ensure sealing performance, 5 pieces winter plugs can meet different needs, suitable for massage bathtub accessories, swimming pool accessories, SPA accessories.< /p> Easy to install and use: directly block the pipe return port, no need to use additional auxiliary fasteners, it only takes a few minutes to operate easily. High-quality material: expansion plugs are made of plastic, meet standard specifications, and are scalable to ensure strict sealing performance and prevent leakage. Wide range of applications: suitable for allotment pools, swimming pools, etc. Skimmer Plug can be used as a pipe plug to plug oil skimmers, return pipes and detergent pipes.