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Kohler 87998 Toilet Flush Valve Kit

Black plastic flush valve with red rubber flapper and grey foam gasket.

chat iconWHAT OUR CUSTOMERS SAY…

“Do you need a vintage plumbing part and nobody seems to be able to find it in your area? Save yourself time and hassle and go to Noel's Plumbing website. You can text them a photo of the part and they will find it in minutes and give you the link to order it, all at a competitive price. My plumbers seem incapable of doing this and hand the job off to me. What can you do? But Noel's always has the 1930s parts I need or the aftermarket part that will get the job done. If I need it fast I can get it in 2-3 days from them and they know exactly what they are doing. It's a good old-fashioned plumbing store with all the parts you could possibly need and people who know how to get them. The service is top level. The staff pick up the phone after one or two rings. They are polite and KNOWLEDGABLE. I'm so tired of dealing with folks who can't find a chicken in a hen house. LOL. ”
-Bry W.
06/23/2026

$52.17

 

The Kohler 87998 is a genuine, 2-inch black plastic and brass toilet flush valve kit. It features a unique lug-and-twist style mechanism designed specifically to replace leaking or worn-out factory components inside select one-piece Kohler toilet models.

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

SKU: 987998 Category: Tag:

Is your Kohler toilet running constantly or flushing weakly? Restore peak performance with the KOHLER 87998 Flush Valve Kit. Designed exclusively as an OEM (Original Equipment Manufacturer) replacement, this corrosion-resistant flush assembly guarantees a perfect seal and reliable, whisper-quiet flushing.

 

87998

 

  • Kohler GENUINE Part
  • Flush valve kit for Gabrielle, Santa Rosa, and other Kohler toilets
  • Compatible with the following Kohler models: Santa Rosa 3323, 3803, 11899, Gabrielle 3322, 14257, 14258, 14286, Kathryn-3324, 14268 and other various models

 

Customer submitted images. 

 

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…

“These people were extremely helpful in taking me through replacing a 25 year old hard water frozen cartridge on my Philrich sink faucet. They were able to identify the correct part I needed from a photo I sent (I had it figured out wrong). I was pleasantly surprised they had an obscure part like this, but they also told me how to extract the old one when I couldn’t get it out. They said to unscrew it after I had concluded from YouTube the old cartridge was supposed to just slide out. It threaded out as they said and saved me buying a cartridge extractor and a hernia. The whole experience has been excellent. ”
-Pete L.
03/10/2026
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