{TAIL ~ a sealing portion} disposed between {HEAD ~ the guide portion} and the tip portion and disposed adjacent the valve seat and 
{ TAIL ~ a sealing portion } disposed between { HEAD ~ the guide portion } and the tip portion and disposed adjacent the valve seat and
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH