a spring around said {TAIL ~ closure valve} in said {HEAD ~ inner bore urging} said valve normally away from closure, 
a spring around said { TAIL ~ closure valve } in said { HEAD ~ inner bore urging } said valve normally away from closure ,
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH