Product description: Quantity: 2 pieces Color: Black Good anti-freeze effect - Use the anti-freeze caps to protect your swimming pool against the harsh winter season. A simple solution that saves your pool from major damage. Multi-function - Expansion plugs can be used as pipe plugs, to plug skimmers, returns and cleaner lines to prevent water from entering pipes during the winter. Easy to use - For testing pool pipe pressure or other detection methods, or to stop the flow of water from the swimming pool when equipment repairs are carried out. Simply screw the plugs into all return and drain openings. High quality - The winter plugs are made of high quality rubber, they have maximum stretchability and can ensure a tight seal , giving you an excellent using experience. Convenient and practical - Designed to meet or exceed standard specifications, strictly follow factory quality control, compact size, easy to carry.