The improvement in {TAIL ~ 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 
The improvement in { TAIL ~ 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
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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