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