1、Used as pipe plugs, to plug skimmers, returns and cleaner lines to prevent water from entering the pipes during winter. 2、Use the freeze plugs to protect your pool against the harsh winter season. A simple solution which prevents your pool from running into serious damage. 3、Made of high‑quality rubber, it has maximum expandability and can make sure a tight sealing, corrosion resistant. 4、As pressure testing pool lines or other methods of leak detection, or stopping water flow from the pool when equipment repairs are made. 5、Built to meet or exceed standard specification, strictly follow factory quality control, compact size, easy to carry. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store