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Match My Model / Toilets & plumbing / Fluidmaster / 3 inch flush valve
✓ Manufacturer-backed fit available

What fits my Fluidmaster 3 inch flush valve?

Manufacturer-backed replacements for the Fluidmaster 3 inch flush valve include Fluidmaster 5403 (flapper). Fit was checked against the manufacturer sources linked below.

Verified fitFlapper · Fluidmaster 5403

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Most toilets with a 3-inch flush valve · Identify by: Flush valve size
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Fit checked Aug 11, 2026Manufacturer sources only for fit verification.
Fluidmaster 3-inch flapper

Measure the flush-valve opening before ordering.

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A verified match on this page applies to the replacement need shown. Manufacturers can use suffixes, revisions, production dates, or platform details that change other parts. If your product label has extra characters, use the full model number before buying.