The 555C is a flapper and drain repair kit. The kit allows you to repair a damaged flush valve drain seat so that your new flapper can make a watertight seal. The advantage of this kit is that it allows you to repair a damaged flush valve without removing the tank and stop the water loss through the drain and flapper. The quickest and easiest way to fix leaks from your flush valve, with its no tank removal peel and stick process. Simply peel the protective paper off the sealant ring and stick right on top of your existing 2 in flush valve seat, it's that simple. The included PerforMAX® 2 in adjustable flapper, has an adjustable dial for a customized flush and water-savings. Other features include a solid frame flapper design to ensure a secure seal and eliminate twisting and built-in Microban® technology to fight bacteria on the flapper itself. Quickly repair leaks, while upgrading your flapper with the PerforMAX® flush valve repair kit.