Good effect: Protect your swimming pool from the harsh winter weather with anti-freeze caps. A simple solution can prevent serious damage to your swimming pool. Application: Use as pipe plugs, to plug skimmers, returns and cleaning lines to prevent water from entering pipes in winter. Multi-purpose: Expansion plugs can also be used for other purposes, such as Such as pressure testing pool pipes or other leak detection methods, or stopping the spread of pool water during equipment repairs. Rubber material: Rubber pool plugs are made of rubber for maximum stretchability to ensure a tight seal. Fine workmanship: exquisite workmanship, beautiful appearance, small size and portable, giving you an excellent using experience. Product Description < p>Scope of application: Use as pipe plugs, plugging skimmers, returns and cleanout lines to prevent water from entering pipes in winter. Expansion plugs can also be used for other purposes, such as pressure testing pool pipes or other leak