The other end of the tube 45 is in {HEAD ~ communication} with {TAIL ~ one end} of the tube 47, the other end of the tube 47 is in communication with one end of the tube 49, and the other end of the tube 49 is in communication with the other end of the tube 50 
The other end of the tube 45 is in { HEAD ~ communication } with { TAIL ~ one end } of the tube 47 , the other end of the tube 47 is in communication with one end of the tube 49 , and the other end of the tube 49 is in communication with the other end of the tube 50
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH