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