Patent ID: 7763170

Claim:
A filter cartridge comprising: a body portion configured to contain at least one filter media, said body portion coaxially surrounding a central axis; and a neck portion depending from the body portion, said neck portion coaxially surrounding a central axis; wherein the neck portion comprises an inlet port for directing a fluid into the body portion, an outlet port for directing the fluid out of the body portion, and at least two lugs depending radially therefrom relative to said central axis, each of the at least two lugs comprising: an upper surface facing substantially axially away from the body portion relative to said central axis; a radially outer surface facing substantially radially away from the neck portion relative to said central axis; an inclined cam surface facing substantially axially toward the body portion relative to said central axis; and a keyed surface formation comprising at least one tooth projecting axially from the upper surface of the lug and facing substantially away from the body portion and at least one tooth projecting radially from the outer surface of the lug and facing substantially away from the neck portion.