Fill Valves

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400H - PerforMAX® Fill Valve

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  • Fix noisy, or slow filling toilet with the quietest, most powerful toilet fill valve
  • A fill valve with both tank and bowl water control for a more powerful flush
  • The adjustability of the bowl water helps newer, 1.28 gpf and lower flow toilets flush efficiently
  • Easy to install
  • Universal fit for most toilets
  • 2X greater bowl refill for a more powerful flush than standard designs
  • EZ-Twist height adjusts from 9 in. to 14 in. to fit more tanks
  • 7 year warranty

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Best for use in 1.28 and 1.6 GPF toilets (can use with older 3.5 GPF models). The Fluidmaster® 400H PerforMAX® Toilet Fill Valve is the newest and most high performance toilet fill valve in our fill valve collection.  The 400H sets the standard for not only performance, but also installation. Featuring new and improved step-by-step pamphlet style instructions, and a pre-installed shank washer for the fastest and simplest install possible. The most powerful fill valve in the market, with 2X greater refill rates than standard models, and ultra-quiet operation. Customize your water use per flush depending on your needs, or toilet model with the easy-to-turn adjustment dials. This universal design is built to adjust, and work with most toilets and brands. The PerforMAX® Fill Valve is a code approved, anti-siphon design that won’t contaminate the fresh water supply. Save-water and achieve top performance with Fluidmaster®’s 400H PerforMAX® Toilet Fill Valve. Fluidmaster’s late Founder invented the fill valve technology in 1958.
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In this video, Jeff Patterson of Home Repair Tutor shows how easy it is to fix a running toilet with the Fluidmaster 400H ® Toilet Fill Valve:


You could also watch this installation video for the 400H fill valve:

400H - PerforMAX® Fill Valve

Download Installation Instructions



Frequently Asked Questions

  • What is the difference between the 400A and the 400H toilet fill valves?

  • What is the Fluidmaster toilet fill valve that I should I purchase to replace my original 400 fill valve?

  • How do I choose the right Fluidmaster fill valve for my toilet?

  • What does higher refill rates mean when describing a fill valve?

  • What does H.E.T. mean?


Cancer and Reproductive Harm -


The 400H - PerforMAX® Fill Valve is available online, from our following retail partners.