{HEAD ~ A plunger} is disposed in the valve body and is reciprocated in {TAIL ~ the bore} 
is reciprocated in
{ HEAD ~ A plunger } is disposed in the valve body and is reciprocated in { TAIL ~ the bore }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL