This disclosure is directed to electrical connectors, and more specifically to a duplex or multiplex electrical connector having an integrally formed connector body having an inlet end portion defining a plurality of passageways for receiving a cable, and an outlet end portion wherein the outlet end portion is provided with an outer surface that slopes downwardly toward the outlet opening and having a complementary sloping or frustro-conical, snap fit, outer, retaining ring with locking tangs and grounding tangs for snap locking the outlet end portion of the connector to an electric box or panel, and including a unidirectional cable retaining sleeve disposed within each of the inlet bores or passageways which are firmly secured therein in a predetermined oriented position relative to the respective passageway, and having a non-conducting bushing sandwiched between the outlet end opening and the outer frustro-conical retaining ring.