In a contemplated design employing {TAIL ~ such a seal post} 502 and ring 504, as the valve 345 articulates or moves outwardly from the fully recessed position illustrated in dashed lines in FIG 14 to a more outwardly position, {HEAD ~ the periphery} of the valve central wall 370 and portion of the skirt 374 may tend to be compressed slightly in the radially inwardly direction to accommodate the movement of the valve 345 
In a contemplated design employing { TAIL ~ such a seal post } 502 and ring 504 , as the valve 345 articulates or moves outwardly from the fully recessed position illustrated in dashed lines in FIG 14 to a more outwardly position , { HEAD ~ the periphery } of the valve central wall 370 and portion of the skirt 374 may tend to be compressed slightly in the radially inwardly direction to accommodate the movement of the valve 345
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