Protect the pipeline: can block the water return pipe to prevent rainwater from entering the freeze and cause the pipeline to rupture, and protect the swimming pool from damage. With rubber ring: To ensure sealing performance, the 5 pieces winter plugs can meet different needs, suitable for massage bathtub accessories, swimming pool accessories, SPA accessories. Easy to install and use: Directly block the pipe return port, no need to use additional auxiliary fixings, it only takes a few minutes to operate easily. High-quality material: The expansion plugs are made of plastic, conform to standard specifications, and are upgradeable to ensure strict sealing performance and prevent leakage. Wide range of applications: suitable for home garden swimming pools, swimming pools, etc. Skimmer Plug can be used as a pipe plug to plug oil skimmers, return pipes and detergent pipes. White color Size: 5.5*5.5*3.3cm Package list: 5pcs becomeveryrich