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Toto THU500S Toilet Flapper

Red and black rubber flapper with chain.

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“Love Noel's Plumbing Supply! They are one of my favorite oddball plumbing parts purveyors. As a professional plumber, I rely on sites like Noel's to keep antique and rare fixtures alive. My customers and I are so grateful! ”
-Danielle E.
03/25/2026

$21.47

 

The TOTO THU500S is a genuine 3-inch universal replacement toilet flapper to fix leaking, running, or poorly flushing toilets. It features an adjustable polypropylene frame with a rubber sealing surface, allowing you to rotate a numbered dial on the flapper to match the exact water-drop requirements of your specific TOTO toilet model.

We can ship anywhere the US Postal Service ships. For orders being shipped outside the US, please contact us at (888) ASK-NOEL, asknoel@noelsplumbingsupply.com, or via the text widget on this screen.

SKU: 33312 Category: Tag:

Fix your running toilet with the ultimate genuine replacement part. The TOTO THU500S 3-Inch Universal Toilet Tank Flapper is the ideal choice for homeowners and plumbing professionals looking to eliminate leaks, stop ghost flushing, and restore original flushing performance.

 

THU500S

 

  • Replacement flapper for 3″ flush valves
  • Replaces THU138S, THU175S, THU331S, THU140S, THU299S, THU253S, THU277S, THU347S, THU275S, THU332S, THU369S, and THU499S
  • Red flapper

 

Common questions about this product

Is this item the original manufacturer's recommended replacement part? chevron-icon

Yes, this is the OEM recommended part.

Is this the correct item for my application? chevron-icon

If you’re not sure text us a picture 1-888-275-6635 or email us a picture at noelsplumbingsupply@fuse.net.

 

We will make sure you have the right part.

 

 

chat iconWHAT OUR CUSTOMERS SAY…

“It is so nice to see you guys are still rocking and providing the best service for unique plumbing parts. I first used you guys 20 plus years ago when my brother turned me on to you. I live in Nashville now and was searching the entire region for a particular cartridge and you are the only one that had it. Hands down there's not many like you and you've always provided a great service and I'm glad to see you doing it now even online! ”
-James
01/11/2022
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