The internal structure can be a ring of solid material, an expanded metal material or screen, a star shaped configuration having a plurality of {HEAD ~ portions} contacting {TAIL ~ 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 
The internal structure can be a ring of solid material , an expanded metal material or screen , a star shaped configuration having a plurality of { HEAD ~ portions } contacting { TAIL ~ 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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