| http://www.w3.org/ns/prov#value | - The hollow cylindrical member 91, which is preferably comprised of a molded plastic material such as polyethylene or polyvinyl chloride, has an overall height sufficient to span that portion of the annular side wall 62 coinciding with inwardly directed flagne 30 of valve securement membe 28 as well as the cylindrical flange 65 of valve 60.
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