Product description: Item type: Winter caps Material: Plastic + rubber ring Color: White Product size: About 5.5x3.3cm/2.2x1.3in(W x H) Wire size: Approximately 4.8 cm (1.9in) Inner diameter: 3.81cm/1.5in Weight: About 107g/3.8oz Application: Hot springs, swimming pools, spas Package list: 5 x winter pool caps Protect the pipeline: winter cap can block the water return pipe to prevent rainwater from entering the freeze and causing the pipeline to rupture pipeline, and protect the swimming pool from damage. With rubber ring: to ensure sealing 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 pipe return port, no need to use additional auxiliary fixings, it only takes a few minutes to operate easily. Wide range of applications: suitable for home 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 avoid leaks.