An electric connector assembly having a connector body defining an inlet end portion and an outlet end portion interconnected by a through bore wherein the outlet end portion is provided with a tapering frustro conical surface that is circumscribed by an external retainer ring of a frustro conical shape complementing the frustro conical outer surface of the outlet end portion. The conical external retainer ring also includes locking and grounding tangs arranged to effect a snap fit connection of the connector assembly to a knock-out hole of an electric box or panel. The electric connector assembly further contemplates the use of internal wire conductor retainer associated with the inlet end portion so as to effect the attachment of an electric wire conductor thereto with a snap fit in a manner that prohibits any unintentional separation of the electric wire conductor therefrom.