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