Toto THU499S G-Max Replacement Flapper, 499S, Black/RED RUBBER Imported Universal toilet flapper. Fits select TOTO toilets requiring a three inch flapper TOTO THU499S Universal Flapper assembly replaces the following TOTO flapper part numbers: THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S