Toilet Fill Valves

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400ACN - Universal Toilet Fill Valve 3-Pack

The Fluidmaster 400ACN3HP5 Universal Toilet Fill Valve 3-Pack includes three of the #1 selling toilet fill valve in the world. This fill valve will fix noisy, leaking and slow filling toilets.

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

Fluidmaster® recommends using the 400A toilet fill valve in older, larger toilets, that date prior to 1994 with flush volumes between 3.5 and 7 gallons per flush. The anti-siphon design eliminates fresh water supply contamination, is code approved, and efficiently uses water. The 400A is a trusted and durable, built from corrosion-resistant materials and featuring a 5 year warranty.

Parts included are: Fill Valve, Shank Washer, Locknut, Refill Tube, Refill Clip and Instructions.

  • Combine and save with this 400A Toilet Fill Valve 3-Pack
  • 400A is the #1 solution to fix noisy toilets
  • Easy-to-install
  • Universal design fits most toilet models
  • Height adjusts easily between 9 in. – 14 in.
  • Replaces old, inefficient or broken fill valves
  • 5 year warranty
  • The #1 best-selling toilet fill valve in the world

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

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:

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


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.

400ACN - Universal Toilet Fill Valve 3-Pack

Download Installation Instructions

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The 400ACN - Universal Toilet Fill Valve 3-Pack is available online, from our following retail partners.