Patent ID: 8911623

Claim:
A filter cartridge for operatively engaging a manifold having an ejection cam and an insertion cam, the filter cartridge comprising: a sump; an inlet/outlet portion extending from one end of the sump having an outside diameter that is smaller than an outside diameter of the sump, and comprising an inlet port and an outlet port; a first lug on the inlet/outlet portion protruding outwardly from a surface of the inlet/outlet portion in a radial direction perpendicular to a longitudinal axis of the inlet/outlet portion; a shoulder surface that is formed by the intersection of the sump and the inlet/outlet portion; and a filter disposed within the sump and in fluid communication with the inlet port and the outlet port, wherein the first lug has an arched surface having a first endpoint, a second endpoint and a curved portion, the curved portion spanning from the first endpoint to the second endpoint and curving away from the shoulder surface, the arched surface being axially spaced from the shoulder surface to form a space between the arched surface and the shoulder surface, wherein the curved portion has a midpoint that is located equidistant from the first endpoint and the second endpoint, the first endpoint of the arched surface being located a farther distance from the shoulder surface than a distance from the midpoint of the arched surface to the shoulder surface, and the second endpoint of the arched surface being located a farther distance from the shoulder surface than the distance from the midpoint to the shoulder surface, and the arched surface of the first lug and the space between the arched surface and the shoulder surface are effective to interact with an insertion cam in a manifold such that engagement of the arched surface and the insertion cam advances the filter cartridge into the manifold and a portion of the manifold occupies at least a portion of the space between the arched surface and the shoulder surface.