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Kohler GP83888 Toilet Flush Valve Gasket Seal

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“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

$12.47

 

The Kohler GP83888 is a genuine gray rubber flush valve seal gasket designed specifically to seal the 2-inch flush valve to the toilet tank on various Kohler one-piece toilets. It functions as a plumbing repair sealing washer that stops water leaks and prevents ghost flushing.

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: 12623A Category: Tag:

Is your toilet constantly running or leaking between the tank and the bowl? Restore your toilet’s efficiency with the Genuine Kohler K-GP83888 Flush Valve Gasket. This high-performance rubber seal is specifically engineered to stop leaks and restore optimal flushing power in your toilet.

 

GP83888

 

  • Kohler GENUINE Part
  • Replacement flush valve gasket for various one-piece Kohler toilets
  • 2″ gasket seals flush valve to the tank
  • Gasket has one ridged edge

 

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…

“Just wanted to thank you for the great service, quality product, and fast shipping, we appreciate all of it. Best, Rod S. ”
-Rod S.
11/11/2023