{HEAD ~ The fine threading} of the valve stem and the larger seat area allow for {TAIL ~ precise resistance} to flow 
allow for
{ HEAD ~ The fine threading } of the valve stem and the larger seat area allow for { TAIL ~ precise resistance } to flow
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH