{HEAD ~ A first planar filter member} is arranged between the cover and intermediate members and a second planar filter member is arranged between {TAIL ~ the intermediate and base members} 
{ HEAD ~ A first planar filter member } is arranged between the cover and intermediate members and a second planar filter member is arranged between { TAIL ~ the intermediate and base members }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL