513-721-5286 | 1-888-Ask-Noel | Mon-Fri: 8:00 AM – 5:00 PM
Account

Kohler K-1138648 Toilet Flapper

Black plastic arm with red rubber seal and braided chain.
Kohler K-1138648 Toilet Flapper - Image 2

chat iconWHAT OUR CUSTOMERS SAY…

“The cartridge in my kitchen sink broke last week so I've been without that sink for a whole week. I ordered a replacement from Noel's, which I could not find anywhere else and it worked perfectly. Thank you! You saved me! ”
-Matt F.
09/19/2025

$15.27

 

The Kohler K-1138648 is a genuine replacement flapper assembly for various Kohler toilets, including the San Raphael K-3722 model. It is a critical component for controlling water flow in the flushing system.

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: 54648 Category: Tag:

Kohler Toilet Flapper 

 

K-1138648

 

  • Kohler GENUINE Part
  • Replacement flapper with float kit for various Kohler toilets
  • For San Raphael K-3722

 

Related document

 

San Raphael K-3722 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…

“Order received and installed. Thank you very much (spoken mentally in my best Elvis voice). Really is nice to know that there is still a business out there that's got their act together! Appreciate the quick service and correct parts shipping. Thanks again.. jP ”
-Jack P.
04/02/2026
Account