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Kohler K-GP51487 Tank Bolt Assembly Kit Gasket

Black rubber gasket with brass screws washers and nuts.

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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

$25.17

 

The Kohler K-GP51487 is a genuine service part designed for most two-piece toilets. It is a complete tank-to-bowl assembly kit used to create a leak-free seal between the toilet tank and the bowl.

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: 12705A Category: Tag:

Stop annoying toilet leaks and restore your bathroom’s efficiency with the Kohler K-GP51487 Genuine Part Tank Gasket Kit. Engineered specifically for most Kohler 2-piece toilets, this kit provides a secure, watertight seal between the tank and the bowl.

 

K-GP51487

 

  • Kohler GENUINE Part
  • For most two-piece toilets
  • Includes bolts, gaskets, washers, nuts and screws
  • Gaskets are made with superior material to ensure a proper seal

 

Related Documents

 

K-3510 Toilet Parts Breakdown

 

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…

“This place is amazing. I live in San Antonio, Texas and there are a few plumbing stores with vintage parts but they never have what I need and the ordering process takes them weeks. I found a rare part at Noels by reverse image search but they will do it for you. I've used them 3 times. Their agents are knowledgable and polite. They will find you the same part or the after market part and get you going on your way. They have 2-3 day shipping. My house was built in the 30's and they know exactly what the after market parts are that I need. I save money and time going to them. I sure wish they were in San Antonio! I will just go directly to Noel's next time - they are LEGENDS! ”
-BP W.
06/21/2026
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