The threaded return line antifreeze plug is a must-have for any pool owner looking to protect their investment during the winter. This heavy-duty winter pool plug is made from sturdy materials that can withstand harsh weather conditions. To use, insert the plug into the return line and twist until it is tightly secured. This will prevent any water from entering the pipes, reducing the risk of freeze damage and costly repairs. Features -Color:Black -Material:Plastic -Size:5.20X5.20X3.00cm/2.04X2.04X1.18in -Thread size:Approx. 4.8cm/1.9in -Inner diameter:3.81cm/1.5in -User-friendly installation: designed for user-friendly installation, the pool antifreeze plug can be easily placed and removed without any special tools -Convenient threaded design: the threaded design of the return plug ensures a good fit and easy installation, making it a practical choice for pool maintenance -Multiple applications: suitable for antifreeze, drainage, and sealing purposes, this plug offers multiple applications for -Cold weather protection: provides effective protection against freezing during cold weather, safeguarding your pool's plumbing system -Protects pool structure: by preventing water from freezing, the antifreeze plug helps protect the pool structure and equipment from potential damage Package list: 4 x Pool Drain Plug