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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.

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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