| http://www.w3.org/ns/prov#value | - FIGS. 7A, 7B, and 7C are diagrams showing the packing 35, wherein FIG. 7A is a front view, FIG. 7B is a plan view, and FIG. 7C is a sectional view taken along line B-B in FIG. 7B. As shown in FIGS. 6 and 7A, an outer diameter D2 of the packing 35 is slightly greater than an inner diameter D1 of the undercap 34.
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