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