The tube in {HEAD ~ said exchanger} is preferably provided by the conduit loop and has a surrounding shell of sufficient strength to withstand the pressure of {TAIL ~ the second fluid}, which in most cases, will be tap water 
The tube in { HEAD ~ said exchanger } is preferably provided by the conduit loop and has a surrounding shell of sufficient strength to withstand the pressure of { TAIL ~ the second fluid } , which in most cases , will be tap water
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH