The Fits TOTO 3 inch Flapper by Korky features an oversized sealing surface to fit large 3 inch TOTO flush valves. The exclusive longest lasting red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. Replacement for TOTO flapper model THU138S, THU175S and THU331S.  This type of toilet flapper is made of flexible rubber for a tight seal and easy to install, the 2021 toilet parts include: (1) Large 3 inch Flapper and (1) Stainless Steel Chain. Fits the following toilet models:

• Replaces TOTO Toilet Flapper model THU138S, THU175S & THU331S
• Easy to install, the Toilet Flapper is made of flexible rubber for a tight seal
• Exclusive longest lasting red rubber resists chlorine 
• Made in the USA
• 5 Year Warranty
• Includes: (1) Toilet Flapper and (1) Stainless steel chain