Korky 2011BP
Score: 72/100
Kohler GP1078441
Score: 85/100Rankings
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 Korky 2011BP is a replacement hinge-style flapper designed specifically for Kohler one-piece toilets, replacing OEM parts #84995 and #1000490. Constructed from flexible rubber with stainless steel components, it features a red finish and is engineered to resist chlorine damage for extended lifespan. It is best suited for owners of Kohler one-piece toilets requiring a durable, chlorine-resistant replacement flapper that matches OEM performance.
| Attribute | | |
|---|---|---|
2 inches | 3.25 inchesbest | |
1 countbest | 1 countbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Material & Durability(1) | ||
Material | Rubber/Stainless Steel | Rubber |
Design & Features(3) | ||
Chain Material | Stainless Steel | Standard |
Installation Type | Hinge | Direct Replacement |
Flapper Type | Hinge | Standard Flapper |
Packaging & Support(1) | ||
Warranty Period | Standard | 1 Year Limited |
Compatibility & Fit(4) | ||
Flush Valve Compatibility | Kohler One-Piece | Kohler Class Five |
Flapper Diameter (inches) | 2 inches | 3.25 inches |
Toilet Type Compatibility | One-Piece | Two-Piece |
Flush Valve Size | 2 inches | 3.25 inch |
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.
“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.”
