Features: 1. Your pool against the harsh winter season. A simple solution which prevents your pool from running into serious damage. 2. Used as pipe plugs, to plug skimmers, returns and cleaner lines - to prevent water from entering the pipes during winter. 3.Expansion plugs have other uses too, such as pressure testing pool lines or other methods of leak detection, or stopping water flow from the pool when equipment repairs are made. 4. Heavy duty plugs made with stainless steel bolts, rubber compression body and are corrosion resistant. Made to work day in, day out. Will last you for many seasons. 5.If you have any questions after receiving the product, please feel free to contact us and we will provide you with a satisfactory answer. Specifications: Material: Rubber, Stainless Steel Packaging 1size: 5*5*5cm Product weight: 60-100g includes: 1*Plug