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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…

“Outstanding fast delivery on two pieces of an ancient Wolverine bath stem for Kohler - from the early 40s I think. The new one has a different body design, but it screwed directly into the old hot/cold tree and was the exact 6" length. Forty eight hours after installation now, and all remains fine. Also, kudos to the people who set up the website and ordering process. Great work - clear photos and info ! PS: I'm not an employee or family...lol. I retired from electrical wholesaling here outside Chicago and I appreciate a good job. ”
-JM C.
07/31/2026

$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…

“Just want to say THANK YOU for your help with this! I couldn't believe the handle arrived Thursday (after ordering Wednesday). I brought it up to my dad's house Friday and just looking at it I didn't think it was going to fit....but it fit perfectly. So appreciative for your expertise and quick shipping! ”
-Ashley K.
02/04/2023
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