
Kohler GP1078440
Score: 80/100
Kohler GP83064
Score: 82/100Rankings

The Kohler GP83064 is a 2-inch red rubber flapper designed as a genuine OEM replacement part for select older Kohler one-piece toilets. It features corrosion and chemical resistance to chloramines and chlorine tank cleaners, ensuring durability in harsh environments. The product includes a stainless steel chain and hook for lever connection, offering an exact fit for specific vintage models without the need for adjustment.

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.
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| Attribute | ![]() | ![]() |
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Material & Durability(2) | ||
Material | Rubber | TPR/Rubber |
Seal Type | Shark-fin | Clip-on |
Design & Features(4) | ||
Chain Material | Not specified | Stainless Steel |
Chain Adjustability | true | false |
Installation Type | Direct replacement | Clip-on |
Flapper Type | Shark-fin | Standard Flapper |
Packaging & Support(1) | ||
Warranty Period | null | 1 year |
Compatibility & Fit(1) | ||
Flush Valve Compatibility | Bottom outlet | null |


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

Search results lack dedicated professional reviews from major outlets like Wirecutter or Consumer Reports. Retailer listings emphasize the product's genuine OEM status, exact fit for listed models, and resistance to corrosion and chemicals, positioning it as a direct fix for aging toilets.
Limited user reviews are available, with feedback praising the product as a simple, problem-free replacement. Common praise centers on easy installation and restored function in compatible toilets, with one user noting the flush valve simply turned into place and the flapper clipped on with no problems.
“Replaces original flapper and flush valve that always gave us problems. Flush valve simply turned into place... flapper simply clips onto it... no problems at all.”

