Winterizing your pool has never been easier with our threaded return line antifreeze plug. This pool plastic plug is specifically designed to block water flow into the return line, safeguarding your pool's plumbing system from freezing temperatures. To install, simply screw the plug into the return line until it is firmly in place. This simple yet effective solution will help you avoid the hassle and expense of repairing freeze . 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 -Effortless installation: the pool antifreeze plug is designed for effortless installation, allowing users to quickly place and remove it as needed -Secure threaded connection: the threaded return pipe stopper design ensures a secure connection, making installation and removal straightforward and reliable -Multifunctional use: this plug is ideal for antifreeze, drainage, and sealing, offering a versatile solution for pool maintenance -Prevents pipe cracking: effectively prevents pool pipes from cracking due to freezing temperatures, providing essential protection during winter -Avoids structural damage: by preventing water from freezing, the plug helps avoid structural damage to the pool and its equipment Package list: 4 x Pool Drain Plug