Feature●Manufacturer Part No.: MP-3183000●Outside Diameter: 4-15/16" (4.9375")●Compatible with Shop-Vac Small Cartridge Filters part number 90398 measuring approximately 5.75 inch diameter and 5 inches high.●Compatible with Vacmaster Beast seres model VF410P, VWMB508 0101, VF409, VF409, VF408B, VFB511B 0201 and filter number VFCF, VJFF, VCPET, V2CFF, VWFD, VCFF●Not compatible with Industrial HangUp Vac or All AroundDescription This retainer fits the small cartridge filters, which are compatible with the 4 Gallon Floormaster, All Around Plus, 5 Gallon Heavy Duty Portable, and the Hang Up Vacs. Not compatible with Industrial HangUp Vac. Not compatible with All Around Outside Diameter: 4-15/16" (4.9375") Manufacturer Part No.: 318-30-00 Compatible with Shop-Vac Small Cartridge Filters measuring approximately 5.75 inch diameter and 5 inches high.