About this item Protect the pipeline: The winter plug can block the water return pipe to prevent rainwater from freezing and causing the pipeline to rupture, and protect the swimming pool from damage. With rubber ring: To ensure waterproof performance, the 5-piece winter plug can meet different needs, suitable for massage bathtub accessories, swimming pool accessories, SPA accessories. Easy to install and use: Directly block the return pipe port, no need to use additional auxiliary fasteners, it only takes a few minutes to operate easily. Wide range of applications: Suitable for family garden swimming pools, swimming pools, etc. It can be used as a pipe plug to seal skimmers, return lines and detergent lines. High-quality material: The expansion plugs are made of plastic, conform to standard specifications and are scalable to ensure strict sealing performance and prevent leaks.