General description Protect the pipeline with this short winter cap featuring an O-ring, designed to block the water return pipe and prevent rainwater from entering the freezer, which could cause the pipeline to break. This cap helps protect your swimming pool from damage. Technical specifications Size: 1 1/2 inch Material: Plastic Includes: 5 winter plugs Installation Easy to install: Directly block the pipe return port without the need for additional fasteners. Simple operation: Installation takes only a few minutes. Usage Suitable for massage bathtub accessories, swimming pool accessories, and SPA accessories. Can be used as a pipe plug to seal oil skimmers, return pipes, and cleaning agent pipes. Applicable for home garden swimming pools and other swimming pool types.