wherein {TAIL ~ the tip portion} is spaced from the tip wall to provide {HEAD ~ a leakage path} between the annular groove and the second check end 
wherein { TAIL ~ the tip portion } is spaced from the tip wall to provide { HEAD ~ a leakage path } between the annular groove and the second check end
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH