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