intermediate member means arranged between said cover and base members to divide said {TAIL ~ filter chamber} into a plurality of filter subchambers, said intermediate member means having planar surfaces arranged adjacent said cover and base member planar surfaces, respectively, a portion of said intermediate member means containing a plurality of segmented circular concentrically spaced throughslots corresponding with {HEAD ~ said cover and base member circular grooves} 
intermediate member means arranged between said cover and base members to divide said { TAIL ~ filter chamber } into a plurality of filter subchambers , said intermediate member means having planar surfaces arranged adjacent said cover and base member planar surfaces , respectively , a portion of said intermediate member means containing a plurality of segmented circular concentrically spaced throughslots corresponding with { HEAD ~ said cover and base member circular grooves }
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