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