Protect the pipeline: Winterizing cap can block the water return pipe to prevent rainwater entering freezing and causing pipeline rupture, and protect the pool from damage. With rubber ring: to ensure waterproof performance , 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 return port of the pipe, no need to use additional auxiliary fittings, it only takes a few minutes to operate easily. High quality material: the expansion plugs are made of plastic, comply with standard specifications and are upgradeable to ensure strict sealing performance and prevent leakage. Wide range 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. Easy to install and use directly block return port of the pipe, no need to use additional auxiliary fittings, it only takes a few minutes to operate easily. With rubber ring to ensure sealing performance, the winter caps 5 pieces can meet different needs, suitable for massage bathtub accessories, swimming pool accessories, SPA accessories. Wide range applications suitable for family garden swimming pools, swimming pools , bathtub, etc.