| http://www.w3.org/ns/prov#value | - The valve device as set forth in claim 1 wherein: a. said valve element is in the form of a discwith the center retained on the flexible free end of said extensible member; b. said disc is an annular member having a thickened peripheral edge portion forming a skirt with a rim thereof extending into sealing engagement with said free end. of said extensible member; and, ' c. said rim of said disc, i
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