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White plastic toilet fill valve with adjustable height shaft and black float cup in retail box

FLUIDMASTER

FLUIDMASTER 400A toilet accessory

SKU CH-ND6Z-Y4TDQ MPN 400A

Universal fill valve fits most toilets with adjustable height from 9 to 14 inches, quiet refill, and anti-siphon protection meeting CSA, UPC, and ASSE codes

  • Product typeOthers
  • Quiet refill fixes noisy toilets
  • Universal design fits most toilet models
  • Adjustable EZ-twist height 9 to 14 inches
  • Anti-siphon design protects fresh water supply
  • Corrosion-resistant materials built for long lifespan

Universal Fill Valve

The Fluidmaster 400A is a universal toilet fill valve designed to replace noisy or slow-filling mechanisms in residential bathrooms. Its adjustable height fits most standard toilet tanks, making it a practical repair choice for homeowners and maintenance professionals seeking a reliable, code-compliant replacement part.

Height Range and Tank Compatibility

The valve adjusts from 9 to 14 inches, covering the majority of common tank depths found in North American installations. It is recommended for toilets rated between 3.5 and 7 gallons per flush manufactured before 1994, while tanks outside this height range or newer high-efficiency models may require a different specification.

Anti-Siphon Code Compliance

The single specification that determines suitability is the anti-siphon design certified to CSA, UPC and ASSE standards. This prevents fresh-water contamination and satisfies plumbing-code requirements for residential installations, ensuring the valve is legal for use in jurisdictions enforcing these approvals.

How it compares

Measured against everything we stock in Toilet Seats & Add-Ons, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 65% of the 427 comparable items (median $17.99).

Specifications

Product
Brand nameFluidmaster Inc
Product typeOthers
Size & build
Shipping weight0.26 kg
Package size311 × 76 × 76 mm

Questions about this item

Will the 400A fill valve work with my pre-1994 toilet that uses 3.5 to 7 GPF?

Yes, the 400A is recommended for 3.5 to 7 GPF toilets pre-1994 and its universal design fits most toilet models with an adjustable EZ-twist height from 9 to 14 inches.

How can I confirm the 400A is refilling correctly after installation?

The tank should refill quietly at a steady rate and the water level must stop at the proper mark without the anti-siphon valve leaking into the fresh water supply.

Does the 400A box include a supply line or just the fill valve with its pre-installed shank washer?

The package contains the 400A fill valve with a pre-installed shank washer and adjustment dial; a supply line is not included and must be purchased separately.

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