Toto THU500S Universal Flapper
Toto THU500S Universal Flapper
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Repair Your Toilet in No Time With the TOTO Universal Flapper
The TOTO Universal Toilet Flapper (THU500S) helps restore reliable toilet performance by providing a secure seal and efficient flush operation. If your toilet is experiencing inconsistent flushes, water waste, or a flapper that no longer seals properly, this replacement part offers a dependable solution.
Designed to fit a wide range of TOTO toilets, the THU500S provides a simple replacement process with no complicated tools required. Its durable construction helps prevent leaks, improve flush efficiency, and maintain proper water usage, making it an easy way to keep your toilet operating at its best.
Key Features
Restore Reliable Flush Performance
A worn flapper can prevent a toilet from maintaining the proper seal between flushes, causing water to slowly leak into the bowl or triggering frequent refills. The TOTO Universal Flapper helps restore consistent tank operation, allowing the toilet to flush properly and maintain water efficiency.
Maintain a Secure Tank-to-Bowl Seal
The flapper plays a critical role in controlling water flow from the tank into the bowl, and a reliable seal helps prevent leaks between uses while ensuring the correct amount of water is released during each flush for dependable performance.
Designed for Compatible 3-Inch Flush Valve Systems
Built for select TOTO toilets with 3" flush valve assemblies, this replacement option provides a precise fit for compatible installations. It replaces multiple previous TOTO flapper models, making it a versatile repair solution for maintaining existing toilet systems.
Replaces: THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S.
Always confirm your toilet model and existing part number before ordering to ensure compatibility.
Simplified Toilet Repairs and Maintenance
Replacing a worn flapper is one of the easiest ways to address common toilet issues without replacing larger components. The included adjustable chain helps simplify installation, making it a practical repair for homeowners, plumbers, and maintenance professionals.
Our Expert Review: TOTO Universal Flapper
Reviewed by: Expert Mack
Summary
If you're on the hunt for a replacement toilet flapper for your Toto toilet, the TOTO THU500S Universal Flapper is definitely worth considering. This product has earned its place as a "Homeowner Favorite," combining durability, ease of use, and affordability into one incredible package. With the added benefit of compatibility with a wide variety Toto toilet, it's an essential repair part for homeowners with compatibly Toto toilets, or service plumbers looking to keep some handy in the van for a running Toto toilet.
Read the Review Read Less Review
Performance: 4.5/5 
The THU500S is so versatile due to the wide range of settings the flapper gives the user, that your toilet will flush like it is brand new. It creates a great seal just like a flapper should, preventing water from leaking into the bowl when it is not activated by the trip lever.
User Experience: 4/5
The flapper is fairly straightforward to install, making it a solid option for DIY enthusiasts. Most people find installation hassle-free, especially if you follow the specific settings for the flapper that Toto outlines for your specific toilet. For professionals, this flapper should be a stock part in the van, I always kept these on hand because of how frequently they're needed for Toto toilets.
Quality: 5/5
Constructed with durable, long-lasting materials, this flapper earns a perfect score in quality. You can count on it to withstand regular use without deteriorating prematurely—a big part of why it has such a good reputation.
Value: 5/5
Affordable, reliable, and easy to install, the THU500S provides outstanding value for its cost. You're getting your money’s worth, making it a smart investment for homeowners and professionals alike.
Final Verdict
If you’re looking for a durable, effective, and affordable toilet flapper, the Toto THU500S Universal Flapper is an excellent choice. Whether you're tackling a DIY plumbing project or stocking up on replacements as a professional plumber, this product won't let you down.
Pro Tip: Be sure to double-check the package to find your specific toilet model and check compatibility before trying to install it.
Since 1917, TOTO has been a global leader in bathroom innovation, known for superior quality, comfort, and design.
Product Details
- Durable 3" sealing surface for reliable flush valve performance
- Creates a secure seal to help prevent leaks and restore consistent flushing
- Helps reduce water waste caused by worn or deteriorated flapper seals
- Simple replacement with included chain for quick installation
- Designed for select TOTO toilets with compatible 3" flush valve systems
- Replaces TOTO part numbers THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S
- Includes an adjustable chain and model-specific installation instructions
Not sure which part is right for your repair? Read our comparison guide, TOTO Universal Flapper vs. Korky Universal Flapper, to see how these two popular replacement parts stack up.
Additional Information
- Brand: TOTO
- MPN: THU500S
- Part Type: Toilet Flapper
- Dimensions: 4-3/4" (L) x 2-1/2" (H) x 3-1/2" (W)
- Thread Size: 3"
- Inlet Connection Size: 3"
- Outlet Connection Size: 3"
TOTO Universal Flapper FAQ
What does the TOTO Universal Flapper do?
The flapper controls the release of water from the toilet tank during a flush and creates the seal that keeps water from continuously flowing into the bowl afterward. When the flapper becomes worn, replacing it can restore proper flushing performance and help prevent unnecessary water waste.
How do I know if my toilet flapper needs to be replaced?
A worn flapper can cause several common toilet issues, including a toilet that runs intermittently, water that continues leaking into the bowl, frequent refilling, or reduced flush performance. If the toilet is not maintaining the proper tank seal, replacing the flapper is often a simple solution.
Is the Universal Flapper from TOTO compatible with all toilets?
No. The flapper is designed for select TOTO toilets that use compatible 3" flush valve systems. While it replaces multiple previous TOTO flapper models, compatibility should always be verified using your toilet model number or existing part number before installation.
What TOTO flapper models does the THU500S replace?
The THU500S replaces several previous TOTO flapper part numbers, including THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S. This makes it a convenient OEM replacement option for many compatible TOTO toilet systems. For assistance selecting the right flapper replacement for your toilet, call our customer service team at 888-682-5956 (toll-free)!
Can replacing the flapper fix a toilet that keeps running?
In many cases, yes. One of the causes for a toilet to continue running after flushing is often a worn flapper that no longer creates a complete seal. Replacing the flapper can restore the connection between the tank and flush valve, helping stop leaks and improve overall toilet performance.
How do I replace the TOTO THU500S Universal Flapper?
Replacing a worn flapper is one of the quickest ways to restore proper toilet performance. After shutting off the water supply and emptying the tank, remove the existing flapper, install the THU500S onto the flush valve, and adjust the chain so it opens and seals properly.
If you'd like a visual walkthrough then watch the installation video, or follow along with our Step-by-Step Guide to Replace a Flapper.
| Weight | 0.2 lb |
|---|---|
| Height | 2.50 in. |
| Length | in. |
| Material | Plastic |
| Room | Bathroom |
| Type | Toilet Parts & Accessories |
| Width | 3.50 in. |
| Inventory Number | TOTTHU500S |
| MPN | THU500S |
