POOL ANTIFREEZE CAP: This rubber winterizing cap can protect your pool pipes in the winter, preventing water from entering and damaging the pipes by freezing. This can extend the life of pool hoses and reduce de-icing problems. WIDE RANGE OF USES: Swimming pool expansion plugs are used as pipes, oil skimmers are blocked, return pipes and detergent pipes, etc. Expansion plugs can also be used to pressure test pool hoses or other leak detection methods, or to prevent water from flowing out during equipment maintenance. HIGH QUALITY MATERIALS: The rubber expansion plug is made of high quality rubber and metal, with maximum stretch to ensure leak proof. It has compact size, corrosion resistance, rust resistance and long service life. EASY TO INSTALL: Our pool anti-freeze caps are moderate in size and very simple and convenient to install. It can be easily installed in seconds without any tools. It is a very practical pool accessory. 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: 51mm Shipping color: black Quantity shipped: 2