Fill Valve & Flapper Repair Kit

Quiet the toilet. Restore the peace. 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 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 Flapper Type: Adjustable 2” and 3″ universal fit Fill Valve Type: PerforMAX 400H (anti-siphon, adjustable height) Material: Chlorine- and hard water-resistant rubber & plastic Toilet Types: Compatible with most toilets 1.28 – 3.5 GPF Warranty: 7-Year Limited Warranty Install Time: ~15 minutes In the Box: Fill valve, flapper, installation hardware, instruction guide Who It’s For DIYers who want a reliable, code-approved repair in minutes Landlords looking to reduce service calls and standardize inventory 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. ** DO NOT USE IN-TANK DROP-IN TOILET BOWL CLEANERS CONTAINING BLEACH OR CHLORINE. USE OF SUCH PRODUCTS WILL RESULT IN DAMAGE TO TANK COMPONENTS AND MAY CAUSE FLOODING AND PROPERTY DAMAGE. USE OF SUCH PRODUCTS WILL VOID THIS WARRANTY. Instead, we recommend using Flush ‘n Sparkle® automatic toilet bowl cleaner. WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.