| http://www.w3.org/ns/prov#value | - FIGS. 12, 13, and 14 are a face view and a section view respectively of: a non-screw end spacer for the embodiment of FIGS. 1, 2, 9, 10, and 11; a screw end and/or intermediate spacer for an embodiment of FIGS. 3, 4, and 5, and a closure plug for any of the embodiments of the invention.
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