Kohler GP1039444 Class Five Flapper for One-Piece Toilets

Kohler GP1039444 Class Five Flapper — One-Piece Toilets

The Kohler GP1039444 is a genuine OEM replacement flapper designed specifically for Kohler Class Five one-piece toilets. The Class Five flush system is engineered for a powerful, bulk-evacuating flush — and the flapper is the heart of that system. When yours starts to leak or degrade, a running toilet and weak flush are the first signs. This direct OEM replacement restores the full force of the Class Five flush and stops water waste at the source.

Key Features

• Genuine Kohler OEM replacement — engineered for Class Five one-piece toilet flush systems
• Ensures the precise seal geometry required for the Class Five’s high-performance flush
• Stops running toilets caused by a worn or warped flapper
• Durable rubber construction resists chlorine, minerals, and normal wear
• Direct drop-in fit — no cutting, trimming, or adapters needed
• Restores full flush power and water efficiency

Why Replace Your Flapper?

A degraded flapper is the #1 cause of a running toilet. On Kohler Class Five one-piece models, using the wrong flapper can also compromise flush performance — the GP1039444 is the correct OEM part that maintains the precise seal and lift characteristics the Class Five system requires. A quick swap eliminates the constant running sound and can save thousands of gallons of water per year.

Compatibility

Designed for Kohler Class Five one-piece toilets. Always verify your toilet model number before ordering to confirm compatibility with the GP1039444 flapper.

Part Details

• Part Number: GP1039444
• Brand: Kohler
• Type: Flapper
• Series: Class Five
• Application: One-Piece Toilets
• Weight: 0.4 lbs