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Kohler K-GP51487 Tank Bolt Assembly Kit Gasket

Black rubber gasket with brass screws washers and nuts.

chat iconWHAT OUR CUSTOMERS SAY…

“Sent Noel’s plumbing and image of what was needed, not being able to find it. They had it sent to me within a week and fitment was perfect. 👍 ”
-Lorenzo H.
03/12/2026

$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, noelsplumbingsupply@fuse.net, 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…

“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