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

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400A - Universal Fill Valve

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The #1 selling fill valve in the world
#1 solution to fix noisy toilets
Easy to install, Universal fit
Trusted by toilet manufacturers and professionals worldwide
EZ-Twist height adjusts from 9″ to 14″ to fit most tanks
5 year warranty
Fluidmaster® recommends using the 400A fill valve in toilets that date prior to 1994 with flush volumes between 3.5 and 7 gallons per flush. Fluidmaster®’s 400A Universal Toilet Fill Valve is the #1 best-selling fill valve in the world! A universal design, with an adjustable height from 9″ to 14″ to fit most toilets. The 400A offers quick refill rates and replaces ballcocks and other toilet fill valves. A trusted and proven toilet fill valve, the 400A is built to last from corrosion-resistant materials for a long lifespan. This code approved, anti-siphon design, won’t contaminate the fresh water supply. Some toilet models not supported: Glacier Bay® or Niagara® Flapperless Toilets, One Piece Toilets. Does not replace Side Entry Valves.

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 502 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: