Fluidmaster 400H-002 vs Korky 528MP MaxPerformance: Which Is Better?

Choose Fluidmaster if you prioritize precise water level adjustments and a longer warranty; choose Korky if you want the fastest fill speed and don't mind a slightly higher chance of noise or leaks.

The key differences: Adjustability — Fluidmaster 400H-002: EZ-Twist height adjustable from 9 to 14 inches; tank and bowl water level dials for customizing flush, Korky 528MP MaxPerformance: Height adjustable via twist; universal for 1.6 GPF and less; water level and bowl fill adjustable (Fluidmaster offers a wider height range and separate dials for tank/bowl water levels, giving more precise control.); Fill Speed — Fluidmaster 400H-002: Reported to fill faster than old valves, but not highlighted as a headline feature, Korky 528MP MaxPerformance: Multiple reviews mention very fast fill times and quick refill between flushes (Korky is consistently praised for rapid filling, a key advantage for high-use toilets.); Installation Ease — Fluidmaster 400H-002: Described as super easy, with step-by-step instructions; many users install in minutes, Korky 528MP MaxPerformance: Easy to install, with a video link; requires basic DIY skills but generally straightforward (Fluidmaster's instructions and install experience receive more frequent praise and detailed user testimonials.); Warranty — Fluidmaster 400H-002: 7-year manufacturer warranty, Korky 528MP MaxPerformance: No warranty specified in provided data (Fluidmaster offers a longer warranty, providing extra peace of mind.).

Across the specs we compared, Fluidmaster 400H-002 comes out ahead on 3 and Korky 528MP MaxPerformance on 2. The better value depends on which of those wins matter most for how you'll use it — check live pricing on Amazon and weigh it against the pros and cons above.

Reviewers most often highlight: "Very easy to install, often in under 5 minutes with clear instructions." The most common complaint: "Some users find it noisy, hissing, or louder than expected." Weigh that against the Korky 528MP MaxPerformance using the full pros and cons above to decide.

Reviewers most often highlight: "Fills the tank very quickly, reducing wait time between flushes." The most common complaint: "Can be noisy, especially at the beginning of the fill cycle." Weigh that against the Fluidmaster 400H-002 using the full pros and cons above to decide.

It's based on AI analysis of 23,123 Amazon customer reviews (16,816 for Fluidmaster 400H-002, 6,307 for Korky 528MP MaxPerformance) alongside the full specifications of both products.