An electrical connector for use in completing at least one electrical circuit is provided which includes a first half-connector body having an inner and outer flange structure which upon insertion into a housing comprising an orifice is effective to substantially envelop edge portions of the orifice to provide a substantially continuous seal between at least side and bottom edge portions of the orifice and connector. The first half-connector body also includes at least one opening for making electrical connection between electrical power-providing components and electrical power-receiving components. In especially preferred embodiments, the inner and outer flange structure define a substantially continuous groove about the periphery of the side and bottom edge portions and the connector includes an upper wall portion having a groove for containing a complementary tongue portion.