Our pool accessory, the threaded return line antifreeze plug, is an essential tool for winterizing your swimming pool. Designed to fit well into your pool's return line, this plug prevents water from entering and freezing in the pipes during the cold months. Simply screw the plug into the return line to create a secure seal, ensuring your pool's plumbing remains intact and unuesd throughout the winter season. 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 -Easy installation: the pool antifreeze plug is designed for easy installation and removal, allowing users to conveniently place it at the pool bottom or sidewall and remove it when needed -Threaded design: the threaded return makes installation and removal simple and convenient, ensuring a and easy maintenance -Versatile use: this plug can be used for pool antifreeze, drainage, and sealing, making it a multifunctional tool for pool maintenance -Freeze protection: effectively prevents pool pipes from cracking during cold seasons, providing essential protection for your pool infrastructure -Prevents water freezing: the primary function of the pool antifreeze plug is to prevent the pool water from freezing at low temperatures, avoiding damage to the pool structure and equipment Package list: 4 x Pool Drain Plug