This post filter made of 3M Filtrete fits the Riccar 8925

Electrostatic Post Filter w/3M Filtrete 8900 Series ( 2 Filters )

Genuine Riccar Electrostatic 3M Post Filter RF89-2 is designed to fit the 8900, 8905, 8920 and 8925 upright vacuums.
2 filters to each package.