{HEAD ~ The center section} includes {TAIL ~ a channel} formed on an external surface thereof, and at least one of the housing members is engaged to the center section to close the channel and form a fluid passage in the center section 
includes
{ HEAD ~ The center section } includes { TAIL ~ a channel } formed on an external surface thereof , and at least one of the housing members is engaged to the center section to close the channel and form a fluid passage in the center section
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH