The glass flow tube is made from mandrel drawn glass to ensure {HEAD ~ high accuracy}, which allows {TAIL ~ interchangeability} from flowmeter to flowmeter with no change in accuracy 
allows
The glass flow tube is made from mandrel drawn glass to ensure { HEAD ~ high accuracy } , which allows { TAIL ~ interchangeability } from flowmeter to flowmeter with no change in accuracy
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH