Universal flapper
Fluidmaster says this universal flapper replaces both 2-inch and 3-inch flappers for most toilets.
✓ Fit checked with manufacturer source
✓ Manufacturer-backed fit available
What fits my Fluidmaster 2 or 3 inch unsure?
Manufacturer-backed replacements for the Fluidmaster 2 or 3 inch unsure include Fluidmaster 523A Super Flapper (universal flapper). Fit was checked against the manufacturer sources linked below.
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Fit checked Aug 11, 2026Manufacturer sources only for fit verification.
Useful when the exact flapper size is the annoying part.
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Compatibility scope
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.