A conduit 78 interconnects {HEAD ~ cannisters} 72, 74 at {TAIL ~ the bottom} of one end 
at
A conduit 78 interconnects { HEAD ~ cannisters } 72 , 74 at { TAIL ~ the bottom } of one end
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH