You may also like
The TOTO Replacement Flapper is designed for use on a selection of TOTO 3 inch flush valve tanks. Adjustable for various tanks, replacing flapper part numbers THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S. Polypropylene body with rubber sealing surface. Flapper includes chain along with instructions for set-up specific to TOTO tank model.
- 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
- 3 inch sealing surface
Manufacturer Resources
Product Specs
- Product Group:
- Washroom/Bath Accessories
- Product Subgroup:
- Parts and Accessories
- Battery Included:
- No
- Product Type:
- Tank Parts
- Product Material:
- Plastic|Rubber
- Department:
- Plumbing
- Parts and Accessories Type:
- Toilet Tank
- Application:
- Toilet
TOTO THU500S – Frequently Asked Questions
1) Will the TOTO THU500S flapper replace a THU138S or THU175S flapper?
Yes. The THU500S is the consolidated replacement for a group of older TOTO flappers: THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S and THU499S. If the flapper you pulled out of the tank carries any of those numbers, the THU500S is the part that takes its place.
2) Does the TOTO THU500S flapper come with a chain, or do I need to buy one?
The chain is in the box. The THU500S ships with its chain and with set-up instructions specific to your TOTO tank model, so nothing else is needed to hook it to the trip lever. That adjustability is also why the instructions matter: the flapper is set differently depending on which tank it is going into.
3) My TOTO toilet keeps running between flushes. Is the flapper the part to replace?
A toilet that trickles or refills on its own with nobody using it is almost always losing water past the flapper seal, and on a 3 inch TOTO valve the THU500S is the service part for that. The rubber sealing face hardens and distorts over time and stops seating on the valve. Swapping it is a tank-side job with no tools beyond disconnecting the chain from the trip lever.
4) What is the TOTO THU500S flapper made of, and will it hold up in a high-traffic restroom?
Polypropylene body with a rubber sealing surface. The rigid plastic frame is what carries the hinge and the adjustment, and the rubber is the part that does the sealing against the valve seat. Rubber is the wear item in any flapper, which is why this is sold as a service part rather than something you rebuild.
5) Is the TOTO THU500S a genuine TOTO part or an aftermarket flapper?
It is TOTO's own part, ordered as THU500S. That matters on a flapper more than on most tank parts, because the seal geometry and the chain length set the flush volume; a generic flapper that fits the opening can still change how much water goes down on each flush.
How fast can I get the TOTO THU500S delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the TOTO THU500S come with a warranty?
Absolutely. The TOTO THU500S is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the TOTO THU500S?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the TOTO THU500S from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.