The Fluidmaster 5103 American Standard Seat Disc was made with the purpose of fixing and upgrading your American Standard Toilets seat disc. A specialty replacement part specifically designed to fit all American Standard actuator flush valves, with snap-on or thread-on actuators. Built to last this replacement toilet seat disc is built from high quality rubber, which can flex, but remains rigid for the best seal possible. A tapered design which includes a brass screw-on adaptor and fits conventional flush valves. Quickly repair old or broken seat discs with this high quality model that showcases a 1 year warranty. The Fluidmaster 5103 American Standard Seat Disc, perfect for simple and effective toilet flush repair.