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