Streamlining the profile of the transition section of the plastic tube, which already has ultra smooth surface characteristics, provides {HEAD ~ a flow passage} that substantially eliminates {TAIL ~ areas} of potential turbulence 
substantially eliminates
Streamlining the profile of the transition section of the plastic tube , which already has ultra smooth surface characteristics , provides { HEAD ~ a flow passage } that substantially eliminates { TAIL ~ areas } of potential turbulence
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH