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