
Kohler GP1078440
Score: 80/100
American Standard 3-Inch Flapper
Score: 70/100Rankings

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.

The American Standard 738920-0070A is a genuine OEM replacement toilet flapper assembly designed specifically for American Standard Cadet 3 model toilets. It offers a reliable, pre-assembled solution for standard 1.6 GPF flushing needs. However, its plastic construction and strict model compatibility limit its versatility and long-term durability compared to premium materials.
| Attribute | ![]() | ![]() |
|---|---|---|
2 inches | 3 inchesbest | |
1 countbest | 1 countbest |
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| Attribute | ![]() | ![]() |
|---|---|---|
Material & Durability(2) | ||
Material | Rubber | Plastic |
Seal Type | Shark-fin | Standard |
Design & Features(4) | ||
Chain Material | Not specified | Standard |
Chain Adjustability | true | false |
Installation Type | Direct replacement | Direct Replacement |
Flapper Type | Shark-fin | Standard Flapper |
Packaging & Support(1) | ||
Warranty Period | null | 1 Year Limited |
Compatibility & Fit(5) | ||
Flush Valve Compatibility | Bottom outlet | American Standard Cadet 3 |
Flapper Diameter (inches) | 2 inches | 3 inches |
Toilet Type Compatibility | One-piece | Two-Piece |
GPF Compatibility | null | 1.6 |
Flush Valve Size | 2 | 3 inch |

Products in the top-left offer the best value (high score, low price).

