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Kohler K-1138648 Toilet Flapper

Red rubber ball with black plastic arm and black chain with stainless clip.
Kohler K-1138648 Toilet Flapper - Image 2

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

$15.27

 

The Kohler K-1138648 is a genuine Kohler replacement flapper assembly designed specifically to fix leaking, running, or phantom-flushing toilets.

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: 54648 Category: Tag:

Is your toilet constantly running or losing water pressure? This high-grade elastomer toilet flapper creates a reliable, watertight seal against your flush valve. Unlike generic, universal toilet flappers that warp or degrade, this Kohler Genuine flapper features enhanced chemical resistance to withstand harsh tank cleaners and water treatments, dramatically extending product longevity. Perfect for quick DIY home maintenance.

 

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
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