Patent ID: 7182864

Claim:
A filter system comprising in combination: a housing having a closed bottom and removable cover, a filter cartridge for insertion into the housing and securing therein by locking the removable cover on the housing, the cartridge being in the form of an open center cylinder having an axis, and having no metallic parts, the housing having at its base an upstanding annular flange having a diameter about the same as the outer diameter of the cartridge, the cartridge carrying a radial seal in the form of a depending skirt fixed to a lower endcap, the skirt having a diameter which causes the skirt to overlie the annular flange such that when the filter is in operation internal pressure creates a radial seal between the skirt and the flange, the cartridge having an upper endcap carrying an axial seal axially positioned to sealing fit between the housing and the cover when the cover is in its locked position, and cooperating supports and stops on the inside of the housing and the lower portion of the upper endcap, comprising an annular ledge formed on an inner surface of the housing cooperating with a plurality of projections on the lower portion of the upper endcap to provide a positive seat and stop which prevents operating pressure from forcing the upper endcap into the filter beyond its seated position.