This winter pool expansion plug is made for durability and reliability. The plug prevents freezing and cracking, making it good for winter pool pipe anti-freezing, it is widely applicable and easy to install. Wide application, stable, threaded design, firm and sturdy, you can use it with confidence. Features -Color:Black -Material:Rubber, Stainless Steel -Size:4.00X3.20X2.50cm/1.57X1.26X0.98in -Durable Use: The pool plug is made of selected material, durable and safe, excellent and simple, serving for long time -Easy Installation: The pool threaded return plug is simple to install and easy to use, to bring much convenience to you -Lightweight and Portable: This pool plug is lightweight, easy and convenient to carry and store when not in use without any effort -Simple but Practical: The simple design will ensure its high performance as excellent swimming accessory -Reasonable Design: Useful and excellent, good for winterizing use, leak-proof and study, threaded design Package list: 1 Plug