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: Pool expansion plugs are used as pipes, oil skimmers are blocked, return pipes and detergent pipes, etc. Expansion plugs can also be used for pool hose pressure testing 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 tightness. It has compact size, corrosion resistance, rust resistance and long service life. EASY TO INSTALL: Our swimming pool 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. YOU WILL GET: A set of products contains 2 pieces swimming pool plugs, the diameter of the plug is 51mm/2", which is suitable for most pipes. It is small in size and easy to carry, which is very suitable for protecting swimming pools in the winter.