Toilet Fill Valves

Products > Toilet Fill Valves

Toilet Fill Valves

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The 400A - Universal Fill Valve is available online, from our following retail partners.

IN THE UNITED STATES:

IN CANADA:

400A - Universal Fill Valve

Fluidmaster 400A Toilet Fill Valve

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The 400A toilet fill valve was introduced in 1975 and is the #1 selling fill valve in the world. It fixes noisy toilets and slow filling toilets.

Best for toilets manufactured prior to 1994 that have 3.5 – 7 gallons per flush.

The #1 solution to fix noisy and slow filling toilets
Easy to install, Universal fit
EZ-Twist height adjusts from 9″ to 14″ to fit most toilets
Corrosion-resistant material
5 year warranty

Some toilet models not supported: Glacier Bay® or Niagara® Flapperless Toilets, One Piece Toilets. Does not replace Side Entry Valves.

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

For best performance of your toilet, consider replacing the flapper along with the fill valve. Fluidmaster recommends the 400CR Repair Kit that has both the 400A fill valve as well as the 2 inch 501 flapper.

Watch this video on how to install the Fluidmaster 400A Fill Valve:

If your fill valve runs continuously or you hear a constant hissing sound, you may have debris trapped in the valve. This video will show you how to properly remove debris from the 400A fill valve:

If removing the debris from the 400A fill valve did not solve your problem, then the next step would be to remove and replace the cap assembly of the 400A fill valve. This video will show you how to remove & replace the cap assembly:

If you are wondering what is the difference between the 400A and the 400AH PerforMAX® fill valve, we have just the right video for you:

To check your toilet’s flush volume, please click here.

400A - Universal Fill Valve

Download Installation Instructions

Fluidmaster Recommends

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Enhance

Frequently Asked Questions

What toilets will the 400A work with?
- The 400A will work in older toilets dating as far back as the 1950’s. The 400A is one of the fastest filling valves in the market and will replace most antiquated technologies like Korky, Burlington Ballcocks, Delta Pro, Danco, and many others. Top toilet brands including: American Standard, Kohler, Gerber, Briggs, Mansfield, Vortens, Eljer, Western Pottery, Jacuzzi, and many more make 2 pc toilets (and some one piece toilets) that will fit the 400A.
How do I raise the water level inside the tank after I installed the 400A?
- Once the fill valve is installed you can adjust the water level by twisting the “Tank water level adjustment screw”. Turn Clockwise for more or a higher water level and Counterclockwise for less or a lower water level.
Why does my 400A keep turning on and off throughout the day & night?
- The fill valve is working properly and is not failing this action or sound is called the “Water Waste Signal”, you may know this more commonly as “Ghost Flushing”. This is the fill valves alert system and it is alerting you that the water inside the tank is leaking out on its own. To learn more about “Ghost Flushing” click here: How to Fix a Toilet Flushing on its own or Ghost Flushing
Are there any repair parts available for my 400A?
- Yes there is, we have two repair or replacement parts available for the 400A and they are:
  
  Replacement Top Cap Assembly (model 385)
  
  Replacement Seal (model 242)
  
  Toilet Fill Valve Hardware (model 250)
Will the 400A work with my flapper?
- The 400A works independently from the flapper and will work with flapper valves
How can I tell if the 400A will work in my toilet?
- To ensure your toilet will work with the 400A simply measure the flush valve (overflow) pipe in the center of the tank. Measuring from the bottom of the tank to the top of the pipe. If the measurement is 6 inches or taller the 400A will fit the tank.
Can I use a filter with my 400A?
- Yes you can but Fluidmaster recommends against it. The 400A will let debris such as solder, rust, dirt and other minerals pass right through the valve. In situations where debris gets trapped inside the valve the top cap can be removed to purge or flush the contaminants out of the valve. To learn how to remove the top and clean the valve click here: Flushing Debris from the 400A toilet fill valve
How can I get a replacement under the warranty?
- You can request a warranty through our website page. Please view the procedure on how to file a warranty replacement here: Warranty Replacement

Problems It Fixes

WARNING:

Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

BUY ONLINE

The 400A - Universal Fill Valve is available online, from our following retail partners.

IN THE UNITED STATES:

IN CANADA:

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