Can this be used as a replacement for thu331s?

I do not know. I think it is a pretty standard Toto flapper. If it looks similar to your current one, I would give it a try.

Will this work on an American Standard brand toilet?

It's designed specifically for Toto toilets and we aren't familiar with that same part on American Standard so we can't guarantee that it will work.

Look on the inside of the top part of your tank on the toilet. It will tell you the model so you can see if the flap will fit or not. Look at those numbers inside.

I received my toto replacement flapper but there are no instructions on how to install--I can probably figure it out but can you send instruction?

We received instructions but very easy to attach. Heck your old one see where it’s hooked. Otherwise go unto website of mfg or Toto

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Essential Values Toto Toilet Replacement Parts - Compatible with 3" Toto Toilet Flapper For G-Max, THU499S, THU331S, THU175S & 2021BP Models

Essential Values Toto Toilet Replacement Parts - Compatible with 3" Toto Toilet Flapper For G-Max, THU499S, THU331S, THU175S & 2021BP Models

Product ID: 59277395

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Details

Color
Red
Material
Rubber
Brand
Essential
Installation Type
Floor Mounted
Shape
Round

💧high-quality rubber seal

🔗rust-proof stainless steel chain

🔧3-inch universal fit

Description

🚽 Upgrade your flush game with leak-proof confidence!

LEAK PROOF SEAL - Durable high-grade rubber ensures water-saving tightness every flush.
ECO FRIENDLY UPGRADE - Replace your old flapper to reduce water waste and lower utility bills.
SMOOTH SAFE HANDLING - Polished, burr-free surface for easy installation without hand scrapes.
RUST RESISTANT DURABILITY - Stainless steel chain with clip hook resists corrosion and breakage.
PRECISION FIT ZERO HASSLE - Universal 3-inch size fits multiple Toto models seamlessly.

The Essential Values Toto Toilet Flapper Replacement is a 3-inch, high-quality rubber flapper designed for G-Max, THU499S, THU331S, THU175S, and 2021BP Toto models. Featuring a rust-resistant stainless steel chain and a smooth, polished finish, it ensures a tight seal to prevent leaks, save water, and reduce your water bill. Easy to install and built for durability, this flapper is the smart, eco-conscious choice for efficient toilet maintenance.

Specifications

Color	Red
Material	Rubber
Brand	Essential Values
Installation Type	Floor Mounted
Shape	Round
Seat Material Type	Plastic
Manufacturer	Essential Values
UPC	754568954519
Global Trade Identification Number	04069942000727
Part Number	EV-Toto-Flapper-G
Item Weight	1.76 ounces
Package Dimensions	4.96 x 4.02 x 2.48 inches
Item model number	EV-Toto-Flapper-G
Is Discontinued By Manufacturer	No
Size	Single Flapper
Batteries Included?	No
Batteries Required?	No

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