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✓ Manufacturer-backed compatibility

Fluidmaster Fluidmaster 523A Super Flapper compatibility

The Fluidmaster Fluidmaster 523A Super Flapper is a manufacturer-backed universal flapper mapped to 1 supported model or identifying case in the current catalog.

Manufacturer sourcesUse these first-party pages to verify current compatibility before ordering.
Fluidmaster 523A

Models this part fits

Fluidmaster 2 or 3 inch unsureNot sure whether the toilet uses a 2- or 3-inch flapper · verified Aug 11, 2026