Kohler K-1237539 Fill Valve Service Kit

Black plastic fill valave with yellow cap white plastic nuts and black rubber washers.

WHAT 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

$29.47

The Kohler K-1237539 is a genuine fill valve service kit used for repairing specific Kohler one-piece toilets.

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: 54539 Category: Toilet Ballcocks Tag: Kohler

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Is your Kohler one-piece toilet running constantly or struggling to refill after a flush? Restore your bathroom’s plumbing performance with the Kohler Genuine Part 1237539 fill valve service kit. Designed, engineered, and rigorously tested by Kohler, this original replacement assembly is the ultimate fix to stop leaks, maintain proper water levels, and achieve smooth, quiet refilling.

K-1237539

The fill valve is a critical component in a toilet tank that controls the flow of water to refill the tank after flushing. This service kit allows the user to repair the existing fill valve by replacing internal components like the diaphragm and O-ring.
This genuine Kohler part is specifically designed for use with certain one-piece toilets, including the San Souci K-5172, K-4007, K-4000, and K-8687 models. It is compatible with various Kohler toilets produced between 1990 and 2001.