Description
Universal Fix for Most Common Toilet Problems
Running toilet? Noisy toilet? Weak flush? The Fluidmaster K-400H kit eliminates them all—without extra trips to the store.
This all-in-one repair solution includes our best-selling PerforMAX 400H fill valve and Super Flapper, designed to restore performance and save water in one easy install.
Whether you’re fixing a legacy 3.5 GPF unit or a newer 1.28 GPF toilet, this kit adapts to your system. And thanks to easy adjustments and built-in durability, it’s trusted by pros and homeowners alike.
Why Pros Choose the K-400H
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Universal Compatibility
Fits most 2” and 3″ flush valve toilets—including Kohler, American Standard, and Toto—without the guesswork. -
Water-Saving Adjustments
Dial-controlled fill and flapper let you fine-tune flow for your toilet’s GPF rating, helping you meet local code and reduce water bills. -
Quiet, Fast Refill
Anti-siphon valve delivers powerful yet whisper-quiet operation for a cleaner bowl and faster tank recovery. -
Durable, Long-Lasting Parts
Chlorine- and hard water-resistant materials reduce breakdown and extend lifespan—ideal for high-traffic bathrooms and rental units. -
Quick Install, Full Kit
Includes everything you need—no tools, no frustration. Installs in under 15 minutes with clear step-by-step instructions.
Specs & Compatibility
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Flapper Type: Adjustable 2” and 3″ universal fit
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Fill Valve Type: PerforMAX 400H (anti-siphon, adjustable height)
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Material: Chlorine- and hard water-resistant rubber & plastic
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Toilet Types: Compatible with most toilets 1.28 – 3.5 GPF
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Warranty: 7-Year Limited Warranty
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Install Time: ~15 minutes
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In the Box: Fill valve, flapper, installation hardware, instruction guide
Who It’s For
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DIYers who want a reliable, code-approved repair in minutes
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Landlords looking to reduce service calls and standardize inventory
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Eco-conscious households that want to cut water waste without sacrificing performance
Restore your toilet’s performance, stop the leaks, and save water—all with one trusted kit.
WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.
