| http://www.w3.org/ns/prov#value | - To help accomplish the above function, the stopper 17 is preferably constructed of an elastomer, such as butyl rubber, and, as is best seen in FIGS. 3 and 8, is in the shape of a cylinder having a transverse wall 85 intermediate its ends, and first and second cylindricalwall portions forming sealing skirts 87 and 89, extending in axially-opposite directions from the transverse wall 85.
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