Shop-Vac Prolong Cartridge Filter: * Fits full size vacs * Does not fit Hang Up Vacs * Compatible with: 5-gallon Contractor Portable, Floormaster Plus, All Around Plus, Heavy Duty Portable, 1x1, BullDog Portable, Mighty Mini, Mini Hangup, Hippo, or All Arounds with 1-1/2 or 2-gallon tank sizes * Approximate size of cartridge: 8"W x 6.5"H