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, meet 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. 1. Due to different monitors and lighting effects, the actual color may be slightly different from the image 2. Due to manual measurement, please allow 1-3cm deviation Size: 5.5cm in diameter Shipping color: white Quantity shipped: 5