{HEAD ~ first conduit} means connecting said {TAIL ~ second end} of said outer tube to said inlet of said pump, 
connecting
{ HEAD ~ first conduit } means connecting said { TAIL ~ second end } of said outer tube to said inlet of said pump ,
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH