KOHLER GENUINE PART 87998 Toilet Flush Valve Kit - OEM Fit

In this review the KOHLER GENUINE PART 87998 Toilet Flush Valve Kit is assessed as a direct replacement for select Kohler tanks; it is best for homeowners and plumbers who need an exact OEM fit to maintain original performance. The single biggest reason to buy is its manufacturer design: this is a Kohler Genuine Part made exclusively for Kohler toilet tanks, which helps protect the original warranty and restores factory operation in compatible models. For anyone with a Santa Rosa, Gabrielle, or Kathryn tank the kit promises a true replacement rather than a universal workaround.

Key Features

• Kohler Genuine Part: Designed by Kohler engineers to match original components and protect the product warranty when used in supported tanks.
• Tank compatibility: Specifically compatible with Santa Rosa, Gabrielle, and Kathryn tank models, providing a precise fit for those listed tanks.
• Corrosion resistant: Built to resist corrosion so the internal parts maintain function over time in a wet environment.
• OEM performance: Intended to restore original flushing performance and sealing behavior when installed in the correct Kohler tanks.
• Replacement clarity: Buyers can confirm fit by checking the toilet tank number printed inside the tank to ensure correct selection.

Who It's For

This kit is aimed at homeowners, maintenance pros, and plumbers who own or service Kohler toilets listed in the compatibility information, and who prefer an OEM replacement to maintain warranty and original performance. It is especially useful when a tank-specific part is required rather than a generic valve that may not seal or align correctly.

Those who should look elsewhere include owners of non-Kohler toilets or Kohler models not listed among the supported Santa Rosa, Gabrielle, and Kathryn tank numbers; universal flush valve kits could be a better fit for other makes or unlisted Kohler models.

Pros & Cons

Pros

• Exact OEM fit for listed Kohler tanks, reducing compatibility guesswork and helping protect the original warranty.
• Corrosion resistant parts are intended to last longer in the tank environment, supporting durability.
• Restores factory flushing performance and sealing when installed in compatible models, providing reliable replacement value.

Cons

• Installation feedback is mixed; some users find it difficult to install, so basic plumbing experience or a pro may be needed.

Specifications

Brand	Kohler Genuine Part
Part number	87998
Compatibility	Santa Rosa 3323, 3803, 11899; Gabrielle 3322, 14257, 14258, 14286; Kathryn 3324, 14268
Fit type	Tank-specific, not universal
Corrosion resistance	Yes, corrosion resistant components
Intended use	Toilet flush valve replacement for specified Kohler tanks

Our Verdict

The KOHLER GENUINE PART 87998 Flush Valve Kit is a sensible buy for anyone with a listed Santa Rosa, Gabrielle, or Kathryn tank who wants an OEM-quality replacement to restore factory performance and preserve warranty coverage. It delivers clear replacement value and corrosion resistance, though buyers should be prepared for a possibly fiddly installation or arrange professional help if unsure.

Frequently Asked Questions

How do I confirm this will fit my toilet?
Check the toilet tank number printed inside the tank and compare it to the compatible model list before purchasing.

Is this a universal flush valve?
No, this is a Kohler Genuine Part made exclusively for specific Kohler tanks and is not a universal fit.

Will this stop leaks?
When installed correctly in a compatible tank it should restore proper sealing, though some users report mixed experiences and installation needs care to avoid persistent leaks.