Therefore, annular lower portion 38 is able to flex resiliently away from container annular flange 18 thereby mitigating stress caused by {HEAD ~ the passage} of {TAIL ~ annular lower portion} 38 over annular container flange 18 
of
Therefore , annular lower portion 38 is able to flex resiliently away from container annular flange 18 thereby mitigating stress caused by { HEAD ~ the passage } of { TAIL ~ annular lower portion } 38 over annular container flange 18
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH