{TAIL ~ The slight reduction} in the diameters of portions of the valve may be characterized as somewhat of a collapsing motion which can occur around the distal end of the lid seal post 502 and which further facilitates the sealing of {HEAD ~ the valve} 345 by the lid seal post 502 
{ TAIL ~ The slight reduction } in the diameters of portions of the valve may be characterized as somewhat of a collapsing motion which can occur around the distal end of the lid seal post 502 and which further facilitates the sealing of { HEAD ~ the valve } 345 by the lid seal post 502
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