An assembly comprising: (a) a sealing adapter for enhancing sealing of a sealing device and a threaded member, said sealing adapter comprising: a generally annular outer shell formed of a first material, the outer shell having first and second longitudinal ends and an inner surface, the inner surface including at least one thread; and a generally annular inner core formed of a second material that differs from the first material, the inner core including a threaded inner surface that combines with the at least one thread of the outer shell to form a threaded arrangement configured to be received on a threaded member; characterised in that: the inner core includes an inner ring, and the outer shell includes upper quarter threads and lower quarter threads; and the inner ring resides radially inwardly of the outer shell and between the upper and lower quarter threads (66, 68); said assembly further comprising: (b) a threaded member threaded onto the threaded arrangement of the adapter; (c) an electrical cable having a connector threaded onto the threaded member, and a sealing boot that covers the connector and engages the sealing location of the adapter. (a) a sealing adapter for enhancing sealing of a sealing device and a threaded member, said sealing adapter comprising: a generally annular outer shell formed of a first material, the outer shell having first and second longitudinal ends and an inner surface, the inner surface including at least one thread; and a generally annular inner core formed of a second material that differs from the first material, the inner core including a threaded inner surface that combines with the at least one thread of the outer shell to form a threaded arrangement configured to be received on a threaded member; characterised in that: the inner core includes an inner ring, and the outer shell includes upper quarter threads and lower quarter threads; and the inner ring resides radially inwardly of the outer shell and between the upper and lower quarter threads (66, 68); said assembly further comprising: a generally annular outer shell formed of a first material, the outer shell having first and second longitudinal ends and an inner surface, the inner surface including at least one thread; and a generally annular inner core formed of a second material that differs from the first material, the inner core including a threaded inner surface that combines with the at least one thread of the outer shell to form a threaded arrangement configured to be received on a threaded member; characterised in that: the inner core includes an inner ring, and the outer shell includes upper quarter threads and lower quarter threads; and the inner ring resides radially inwardly of the outer shell and between the upper and lower quarter threads (66, 68); said assembly further comprising: the inner core includes an inner ring, and the outer shell includes upper quarter threads and lower quarter threads; and the inner ring resides radially inwardly of the outer shell and between the upper and lower quarter threads (66, 68); said assembly further comprising: (b) a threaded member threaded onto the threaded arrangement of the adapter; (c) an electrical cable having a connector threaded onto the threaded member, and a sealing boot that covers the connector and engages the sealing location of the adapter.