Kohler GP1078440
Score: 80/100
Korky 100BP
Score: 90/100Rankings
The Korky 100BP Ultra High Performance Flapper is a universal 2-inch toilet flapper designed to maximize flush performance while conserving water across various gallon-per-flush ratings. Constructed from exclusive chlorine-resistant red rubber, it offers superior durability in harsh water conditions and features adjustable settings for precise water optimization. It is best suited for homeowners with standard 2-inch toilets in areas with chlorinated, hard, or well water.
The Kohler GP1078440 is a genuine 2-inch shark-fin style toilet flapper designed as a replacement part for select Kohler one-piece toilets. It features a corrosion-resistant rubber construction with a red finish and includes an adjustable chain for secure sealing and efficient flushing. This part is specifically engineered for bottom outlet flush valves to ensure a reliable fit.
| Attribute | | |
|---|---|---|
2 inchesbest | 2 inchesbest | |
1 countbest | 1 countbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Material & Durability(3) | ||
Seal Type | Shark-fin | Sealing Ball |
Hard Water Resistance | null | true |
Water Resistance | null | true |
Design & Features(3) | ||
Chain Material | Not specified | Stainless Steel |
Installation Type | Direct replacement | DIY |
Flapper Type | Shark-fin | Adjustable Flapper |
Packaging & Support(2) | ||
Warranty Period | null | 5 Years |
Certifications | null | |
Compatibility & Fit(4) | ||
Flush Valve Compatibility | Bottom outlet | 2-inch |
Universal Fit | false | true |
Toilet Type Compatibility | One-piece | Standard |
GPF Compatibility | null | 1.28-5 |
Products in the top-left offer the best value (high score, low price).
Professional reviewers and plumbing experts, including those from Clorox, highly endorse the Korky 100BP as the longest-lasting flapper available. Editors at supply sites praise its high performance and precise water control, noting that it significantly outperforms generic brands in chlorine resistance tests. The product is highlighted for its universal design, making it ideal for contractors who need a single solution for various toilet brands, with no performance drop across different flush volumes.
Everyday consumers rave about the product's longevity, with many reporting it lasted up to seven years in harsh water conditions. Users frequently praise the ease of installation, noting it takes only five minutes without tools. Common themes include strong flush performance despite water savings and perfect fits for brands like Kohler. Recurring complaints focus on the chain being too long and occasional initial seal issues that require adjustment.
“lasted 7 years in hard well water”
“5 minutes, no tools”
“saves hundreds of gallons yearly”
