POOL ANTIFREEZE CAP: This rubber winterizing cap can protect your pool pipes in 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 hoses, oil skimmers are blocked , return hoses and detergent hoses, etc. Expansion plugs can also be used to pressure test pool hoses or other methods of leak detection, or to prevent water from flowing out during equipment maintenance. < p>HIGH-QUALITY MATERIALS: The rubber expansion plug is made of high-quality rubber and metal, with maximum stretch to ensure a tight seal. It has compact size, corrosion resistance, rust resistance and long service life. EASY TO INSTALL: Our swimming pool antifreeze caps are moderate in size and are very simple and practical to install. It can be easily installed in seconds without any tools. It is a very practical swimming pool accessory. YOU WILL GET: One set of products contains 2 pieces swimming pool plugs, the diameter of the plug is 51mm/2", which is suitable for most pools. pipes.It is small in size and easy to carry, which is very suitable for protecting swimming pools in the winter.