Toilet Fill Valves

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400H - PerforMAX® Fill Valve

Fluidmaster Toilet Fill Valve to Fix Weak Toilet Flush
Toilet Fill Valve Replacement
Fix Weak Toilet Flush with Fluidmaster 400H Fill Valve

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You can purchase this toilet fill valve from the Fluidmaster Online Store

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In an independent study, rates this fill valve as the highest rated valve for 2023. Click here to read the article: Best Toilet Fill Valve

Are you tired of experiencing weak toilet flush? Fluidmaster has the perfect solution for you with the 400H Toilet Fill Valve.

Our innovative design ensures a powerful flush every time. The 400H Toilet Fill Valve has been specifically designed to boost your toilet’s performance, providing a consistent and reliable flush. Say goodbye to the frustration of weak flushes and hello to a cleaner and more efficient toilet.

Easy to install, the 400H Toilet Fill Valve fits most toilets and is one of the quietest fill valves available. The 400H comes with both tank and bowl water control for a more powerful flush. The adjustability of the bowl water helps this valve work in all older as well as newer toilets.

What’s more, the 400H Toilet Fill Valve is incredibly durable and long-lasting, so you won’t have to worry about replacing it anytime soon. Its high-quality materials ensure it can withstand even the toughest of toilet environments.

Don’t settle for a subpar toilet experience any longer. Upgrade to the 400H Toilet Fill Valve and enjoy a powerful, efficient, and hassle-free flush every time. Order now and see the difference it can make in your daily routine.

  • Fix a weak toilet flush, constantly running, noisy, or slow filling toilet with the quietest, most powerful toilet fill valve
  • Get a more powerful flush and less clogs with our patented Tank AND Bowl water control system
  • The adjustability of the bowl water helps newer, 1.28 gpf and lower flow toilets flush efficiently
  • Universal design is quieter, helps save water, and is easy to install
  • 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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If you have a toilet that is running constantly, this video will show you how to fix the problem:


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

To download our free guide to fix common toilet problems please click here: Fluidmaster Toilet Repair Guide

400H - PerforMAX® Fill Valve

Download Installation Instructions


  • UPGRADE Toilet Repair Kit
  • ALSO REPLACE 2" Universal Toilet Flapper
  • ENHANCE Toilet Cleaner System

Frequently Asked Questions

  • How do I know which toilet fill valve fits my toilet?

  • Are toilet fill valves universal?

  • How do I know if my toilet fill valve is bad?

  • Are all the fill valves the same for toilets?

  • 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?

  • What is the difference between the 400H and 400AH fill valve?


Cancer and Reproductive Harm -


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