Fluidmaster 400A Toilet Tank Repair Fill Valve – 2 Pack | 9–14 in Adjustable

The Fluidmaster 400A Toilet Tank Repair Fill Valve is a widely trusted universal replacement for many toilets. With an adjustable height range from 9 to 14 inches, it can be tuned to fit most tanks without a full remodel. This model replaces ballcocks and other older fill valves, delivering a reliable refill experience that many households depend on daily. The 400A is built to last with corrosion‑resistant materials, offering durable performance in busy bathrooms and utility spaces.

Safety and water quality come first with Fluidmaster: the 400A features an anti‑siphon design that helps keep the fresh water supply clean during refill. This code‑approved feature is standard for many homes and commercial setups, giving peace of mind for households, rental properties, and public facilities. The valve’s robust construction pairs with easy maintenance, making it a practical upgrade for typical toilet wear and tear.

Key features at a glance

• Easy-to-install
• EZ twist height adjusts from 9 to 14 inches to fit most tanks
• Set of 2 included

Performance and compatibility

• Fast refill rates help the toilet regain full flush readiness quickly
• Corrosion-resistant materials designed for longevity
• Anti-siphon design protects the clean water supply
• Code-approved for safe operation in many homes and facilities

Whether you are upgrading an aging toilet, maintaining a busy rental, or refreshing a restroom before guests arrive, the Fluidmaster 400A offers a flexible upgrade path. The 9–14 inch height range covers many common tank sizes, and the set of 2 helps you outfit more than one toilet with a single purchase.

Important compatibility note: Some toilet models are not supported, including Glacier Bay or Niagara flapperless toilets and One Piece toilets. The unit does not replace side-entry valves. Fluidmaster’s legacy in fill valve technology dates back to 1958, reflecting a long history of engineering and reliability.