Quick change filter cartridge and head therefor

Abstract From the Canadian patent

A filtering device includes a head intended to be permanently installed in a fluid dispensing machine and disposable canister therefor. A central chamber is formed in the head which chamber is in communication with an inlet port and outlet port for receiving an unfiltered liquid and supplying a filtered liquid respectively. The disposable canister has a flask shaped main body with a flat top and a neck of substantially uniform diameter on the top. The neck first in the central chamber. A tune extending through the neck defines an annular clearance between the tube and the interior of the neck which annular clearance is in fluid communication with the inlet port. The opening into the tube …