| http://www.w3.org/ns/prov#value | - The pivot head 33 can be configured with surfaces that register in an operative self-sealing configuration where an O-ring, gasket or other sealing means, is seated (such as between the coupler 44 outer surface and the socket 45 inner surface) when the pivot head 33 and casing horn 32 are moved to reside along the axial centerline and are substantially axially aligned.
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