{TAIL ~ The improvement} in a fluid valve 12, wherein said PTFE male and female rings are formed of {HEAD ~ carbon filled PTFE} and said V ring therebetween is formed of unfilled PTFE 
{ TAIL ~ The improvement } in a fluid valve 12 , wherein said PTFE male and female rings are formed of { HEAD ~ carbon filled PTFE } and said V ring therebetween is formed of unfilled PTFE
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH