The internal structure can be a ring of solid material, an expanded metal material or screen, {HEAD ~ a star shaped configuration} having {TAIL ~ a plurality} of portions contacting an inner diameter of the filter pack, or a solid metal structure which may include an internal porous structure screen of wire mesh or expanded metal attached thereto 
having
The internal structure can be a ring of solid material , an expanded metal material or screen , { HEAD ~ a star shaped configuration } having { TAIL ~ a plurality } of portions contacting an inner diameter of the filter pack , or a solid metal structure which may include an internal porous structure screen of wire mesh or expanded metal attached thereto
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