The material used in the plug is of durability, ensuring that it is resistant to wear and tear. The plug is highly durable, making it a good choice for winter pool maintenance. The plug is designed to prevent freezing and cracking. It is suitable for preventing winter pool pipes from freezing. Features -Color:Black -Material:Rubber, Stainless Steel -Size:4.00X3.20X2.50cm/1.57X1.26X0.98in -Excellent Performance: Good workmanship, useful and durable to use, leak-proof and practical, excellent performance - Use: Made by selected material, safe and durable, which could be used for very long time -Leakproof: The screw can be screwed tightly, and with rubber material, easily prevent water leakage, useful and reliable -Simple Operation: This threaded designed is very easy to install and simple to operate, giving you huge convenience -Wide Application: Useful and stable, threaded design, firm and sturdy, you can use it with confidence Package list: 5 x Pool Plug