Pick the brand
The brand is printed on the same plate as the model number.
Filters that come up most
The part numbers listed for the most shop vacs in the index. Open one to see every model it fits.

VF4000Cartridge filter15 shop vacs
VF5000Cartridge filter12 shop vacs
9-17804Cartridge filter10 shop vacs
9-17816Cartridge filter10 shop vacs
551006114Cartridge filter10 shop vacs
17810Cartridge filter9 shop vacs
VF7000Foam sleeve9 shop vacs
VF6000Cartridge filter9 shop vacs
204309Dust bag7 shop vacs
49-90-1977Cartridge filter7 shop vacs
49-90-1978Cartridge filter7 shop vacs
49-90-1990Foam sleeve7 shop vacsWhere the model number is
On shop vacs, the plate or sticker sits in one of a few places.
Shop vacs: On a label on the motor head or the side of the tank.