
Kohler GP85160
Score: 85/100Fluidmaster 506 Flapper
Score: 70/100Rankings

The Kohler GP85160 is a genuine 2-inch blue toilet flapper featuring an integrated adjustable float, designed specifically for 1.6 GPF two-piece Kohler toilets. It offers a tight seal to prevent leaks and includes durable, chlorine-resistant vinyl construction for long-lasting performance. The product comes with a 5-year warranty and is intended as a direct replacement for failing flappers in compatible models.
The Fluidmaster 506 is a universal, non-adjustable 2-inch flexible frame flapper designed for older pre-1994 toilets with 3.5+ GPF flush valves. Its main trade-off is the lack of adjustability and modern durability features, making it less suitable for water conservation. It is best suited for DIY users replacing flappers on older, high-volume toilets with irregular valves.
| Attribute | ![]() | Fluidmaster 506 Flapper |
|---|---|---|
2 inchesbest | 2 inchesbest | |
1 countbest | 1 countbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | ![]() | Fluidmaster 506 Flapper |
|---|---|---|
Material & Durability(5) | ||
Material | Plastic/Vinyl | Rubber |
Seal Type | Tight seal | Flexible |
Chlorine Resistance | true | Unknown |
Hard Water Resistance | null | Unknown |
Water Resistance | null | Unknown |
Design & Features(4) | ||
Chain Material | null | Unknown |
Chain Adjustability | true | false |
Installation Type | Direct replacement | Standard |
Flapper Type | Flapper with Float | Flexible |
Packaging & Support(2) | ||
Warranty Period | 5 years | 1 year |
Certifications | None | Unknown |
Compatibility & Fit(5) | ||
Flush Valve Compatibility | Bottom outlet | 2 inches |
Universal Fit | false | true |
Toilet Type Compatibility | Two-piece | Pre-1994 |
GPF Compatibility | 1.6 | 3.5+ GPF |
Flush Valve Size | 2 | 2 inches |

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

Retailers and product pages from major home improvement stores describe the Kohler GP85160 as a reliable and efficient solution for toilet maintenance. Reviewers highlight its high-quality materials and precise water level control capabilities, noting it as an ideal choice for homeowners seeking hassle-free performance.
Everyday users generally praise the product for its ease of installation and effectiveness in preventing leaks. Common themes include satisfaction with the adjustable float feature for customizing water levels and the durability of the vinyl material.
Sources lack independent professional reviews or editorials; descriptions are primarily from the manufacturer and retailers. Fluidmaster categorizes the 506 as an all-rubber 2-inch non-adjustable flapper, noting that its flexible frame is specifically designed to suit oddly sized or angled valves better than rigid solid-frame types. It is emphasized as a simple and easy-to-install replacement for older toilets.
No consumer reviews, ratings, or testimonials are included in the available sources. Consequently, common praise such as ease of install and complaints regarding durability cannot be detailed with real user data.
