Made from high-quality, durable rubber with better resistant and durable. Compatible with American Standard Champion 4 and Eljer Titan 4 Gasket outer diameter - 4 1/4", O-ring outer diameter - 9/16 Toilet gasket seals wear out over time and need to be replaced, replacement creates better flushing pressure and results in a quieter toilet Fits American Standard Champion 4 and Eljer 4 Flush Valve Seal is designed to replace the American Standard part: 7301111-0070A