STURDY DURABLE: Our toilet stopper flapper is made of premium rubber, resistant to corrosion and chlorine, suitable for city water, hard water, and well water. The toilet plug features a stainless steel chain that can be easily adjusted to a suitable height. COMPATIBILITY: Compatible with most 3-inch toilet stopper flappers, including TOTO models CST743S, CST44S, CST44SD, CST44SDB, CST44SLD, CST44SLDB, CST54SF, CST64S, CST774S, CST784SF, CST79SF, CST804S, MS756204SF, MS853113S, MS854114S, MS874114S, and others. This is an efficient toilet repair part. SAVE WATER: These toilet drain plugs feature an integrated design with high manufacturing precision. They resist deformation, offer long life, and provide excellent sealing. The rubber forms a tight seal to ensure maximum flushing efficiency and water savings. EASY TO USE: Simple to install with two steps: first, replace your leaky and inefficient toilet flapper; second, install the new toilet flapper and adjust the chain to the appropriate height to complete installation.