Patent ID: 8801925

Claim:
A filter cartridge comprising: (a) at porous cartridge body; (b) a porous core; (c) as filter material between the body and the core; (d) a first endcap being liquid tight sealed to as first end of the body and a first end of the core; (e) a second endcap having an opening alignable with the core, the second endcap being liquid tight sealed to a second end of the body and the opening being liquid tight sealed to the core such that fluid entering, the porous cartridge body must flow through the filter material before reaching the core and must flow through the core before reaching the opening; and (f) a first removably attached alignment device secured only to an outer surface of the body adjacent the first endcap wherein the alignment device comprises a base capable of being removably attached to the filter cartridge and wherein the base comprises an exterior diameter that is less than the diameter of the housing structure and a height sufficient to cause the filter cartridge to seat in a housing head and a width sufficient to center the filter cartridge within the housing bowl, when assembled, (g) a second removably attached alignment device secured only to an outer surface of a portion of the body at a location between the first endcap and the second endcap, the second alignment device having an exterior diameter that is less than the diameter of the housing structure such that when the cartridge with the first and second alignment devices is placed into a bowl-type housing, the cartridge is centered within the bowl and is of as height sufficient to ensure a liquid tight mating of the opening of the second endcap with a corresponding opening in the housing by the alignment devices.