Patent ID: 8440079

Claim:
A liquid filter cartridge comprising: (a) a region of filter media defining a central, open, volume; (i) the region of filter media having first and second ends; (b) the first end cap secured to the first end of the region of filter media; (i) the first end cap including an axial stem thereon defining a central liquid flow conduit therethrough, in liquid flow communication with the central, open, volume defined by the filter media; (A) the axial stem projecting away from the media; (B) the axial stem including an outer, annular, seal arrangement thereon comprising an o-ring seal member; and, (C) the axial stem having an end remote from the o-ring seal member comprising a plurality projections spaced from one another by guide channels; each guide channel being positioned at a location between the o-ring seal member and an end of the axial stem remote from the seal; and, (D) each one of the plurality of projections having a non-blunt end defined by an apex an a pair of sides extending at an angle, around the apex, within the range of 110°-170°; and, (d) a second end cap secured to the second end of the media.