Korky Combo Pack- (1) Korky 528MP MaxPerformance Fill Valve and (1) Korky 16BP Universal Flapper The most universal replacement fill valve Designed for optimum performance in TOTO, Kohler and American Standard toilets Designed For Newer, Since 1995, 1.6-Gallon Toilets Saves up to 50-Percent More Water in Standard Toilets, Older Than 1995 Get Both Parts - Great Value Pack