Kohler Seal 83888 | Noel splumbing Supply

“Kohler K-GP1059291 Seal for All Single Flush Class 5 and 6 Canister Toilets” has been added to your cart. View cart

WHAT OUR CUSTOMERS SAY…

“Noel's Plumbing Supply found this place on Google maps. In and out service. The person I was speaking to the desk offered me a selection knew exactly what I needed price was really reasonable. You don't know how much it means to a homeowner to be able to come in without any run around trying to sell you something you don't need. I recommend this establishment to all my family and friends. ”

-Steve C

$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: Toilet Repair Kits Tag: Kohler

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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

Yes, this is the OEM recommended part.

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.

WHAT OUR CUSTOMERS SAY…

“I spent the balance of 3 days looking locallyfor a replacement head for our Kitchen sink...only to find these guys with an exact fit and finish and lower than market pricing...I immediately ordered (an awesome website with smooth cart checkout). 20 minutes later I find a blown out gasket/ring that I was able to replace, and avoid having to replace entire spray head. I text there support line ( while the store was closed!) Requesting the order to be canceled. Within minutes and without hesitation or questions they had refunded my card and canceled the order. They have one of the largest online inventories, notably stocking harder to locate stuff and boasting a separate text line dedicated to recieve customer pics of parts/gear to ensure we are getting exactly what we need. Enough said. Bring your future plumbing problems/needs here and trust you will be taken care of...I know I will... @ Noels, thanks for continuing a tradition of honorable business practice, in a world that is littered with allot less... ”

-John M.

03/14/2026