Feature●FITS ALL 3" FLUSH VALVE TANKS: This toilet tank flapper works great. But, it is important to remember that this is a generic model that replaces a wide range of Toto models - each with a slightly different shape. It will fit most of the model well and will do the job.●EASY TO GET INSTALLED: This toto style toilet flapper replacement is easy to install with handle toilet flush tank lever simply by yourself, no need for plumbers or handy tools.●COMPATIBLE WITH TOTO FLAPPER MODELS: Replacement flapper: Designed for use on a selection of TOTO 3 inch flush valve tanks. Replaces the following TOTO flapper part numbers: THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S●DURABLE PLASTIC AND STAINLESS STEEL CHAIN: It is plastic and has stainless steel chain and long lasting. This repair toilet flapper replacement comes with stainless steel chain that is resistant, and long lastingDescription FITS most..TOTO Style THU253S/THU277S/THU500S Flapper - FITS ALL 3 Inch Flush Valve Tanks