2021BP Korky Fits Toto G-MAX 3 in Flapper The Fits TOTO G-Max 3 in Flapper by Korky features an oversized sealing surface to fit large 3 in TOTO flush valves. The exclusive longest lasting red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. Authorized replacement for TOTO G-Max flapper model THU138S. Fits the following models: CST743S, CST743SD, CST743SDB, CST44S, CST44SD, CST44SDB, CST44SLD, CST44SLDB, CST54SF, CST64S, CST774S, CST784SF, CST79SF, CST804S, MS756204SF, MS853113S, MS854114S, and MS874114S. Made of flexible rubber for a tight seal and easy to install, the 2022 includes: (1) Large 3 in Flapper and (1) Stainless Steel Chain.Specific fit for TOTO flapper model THU138SFits 3 in flush valve openingStainless steel chain attachmentFlapper made of chlorine resistant rubberMade in USA5 year warranty