Kohler GP1078441
Score: 85/100
TOTO THU500S Flapper
Score: 75/100Rankings
The Kohler GP1078441 is a genuine OEM replacement flapper designed specifically for Kohler two-piece toilets featuring Class Five flushing technology. Its key strength is the precise 3.25-inch rubber seal that effectively prevents phantom flushes and maintains high-efficiency performance. However, it is incompatible with non-Kohler models and may degrade faster in hard water environments.
The TOTO THU500S is a 3-inch OEM replacement flapper designed exclusively for select TOTO toilets with 3-inch flush valves. It features a polypropylene body with a rubber sealing surface and includes an attached chain for straightforward installation. Ideal for DIY tank maintenance in residential bathrooms to fix leaks or inconsistent flushing.
| Attribute | | |
|---|---|---|
3.25 inchesbest | 3 inches | |
1 countbest | 1 countbest |
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| Attribute | | |
|---|---|---|
Material & Durability(1) | ||
Material | Rubber | Polypropylene/Rubber |
Design & Features(3) | ||
Chain Adjustability | false | true |
Installation Type | Direct Replacement | Tool-Free |
Flapper Type | Standard Flapper | OEM Flapper |
Packaging & Support(1) | ||
Warranty Period | 1 Year Limited | 1 Year |
Compatibility & Fit(4) | ||
Flush Valve Compatibility | Kohler Class Five | TOTO 3-Inch |
Flapper Diameter (inches) | 3.25 inches | 3 inches |
Toilet Type Compatibility | Two-Piece | TOTO Specific |
GPF Compatibility | 1.28 | null |
Products in the top-left offer the best value (high score, low price).
Plumbing experts and editors from sites like Ferguson and CPE Supply highly recommend this part as the definitive OEM replacement for Class Five systems. They highlight its precise 3.25-inch seal as critical for preventing phantom flushes and its durable rubber construction for resisting corrosion.
Everyday consumers generally report high satisfaction, with many noting that the flapper perfectly fits their Kohler models and restores the toilet to like-new flushing performance. Common praise includes the ease of installation and the elimination of running toilet noises.
Product descriptions characterize it as a quiet, dependable OEM upgrade that transforms frustration into reliable performance, emphasizing its adjustability and precise fit for TOTO tanks.
There is no available consumer feedback, testimonials, or forum discussion data for this product.
“Perfect fit for my Kohler Cimarron-flush like new!”
“No more running toilet; lasted 2 years in hard water”
“Installed in 2 minutes, chain included.”
