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Kohler 1037307 Toilet Tank Gasket

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“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

$9.47

 

The Kohler 1037307 is a genuine OEM replacement tank-to-bowl gasket designed specifically for Kohler pressure-assist toilet tanks. It provides a watertight seal between the tank and the bowl to prevent leaks during 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: 12922 Category: Tag:

Stop leaks at the source with the Kohler 1037307 Tank-to-Bowl Gasket. Engineered specifically for Kohler pressure-assist toilets, this high-quality black rubber gasket ensures a watertight, secure seal between your toilet tank and bowl, preventing common leaks in high-performance fixtures. This genuine OEM part is designed for longevity and easy installation, making it the perfect choice for DIYers and professional plumbers alike.

 

1037307

 

  • Provides a secure, watertight seal between the toilet tank and the bowl, preventing leaks.
  • Made from high-quality, durable rubber.
  • Designed specifically for use with various toilets that utilize the Sloan Flushmate pressure-assist systems, particularly the K-503 series pressure-assist tanks. It is not for use with standard gravity-flush toilets.
  • The part is designed for easy installation, allowing you to replace a worn gasket without the help of a plumber.
  • The inner diameter is approximately 2-1/8 inches, and the thickness is around 1-3/16 inches.

 

Related document

 

Kohler Highline Classic Toilet Tank 1.6 gpf Parts Breakdown

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…

“This place rocks! I have replaced two parts for an old Gerber faucet in the laundry tub. After the spout was leaking, I could not find the right washers anywhere. I had to replace the whole spout, which they had in stock, and it was priced competitively. Now, not a drop leaks. ”
-John D.
02/03/2024