A connector assembly having a slot aperture retainer ring for securing a connector body to an electrical box, with a slot adapted to receive a common tool, such as a screwdriver, to facilitate removal of the retainer ring from inside the electrical box. In one embodiment, the slot of the retainer ring is aligned generally perpendicular to a center axis of the retainer ring. One or more inwardly bent preload fingers or tabs engage an outer surface of the connector body upon assembly. A connector assembly utilizing a shoulder structure to capture a wall portion of an electrical box is described wherein the wall portion is held between the shoulder structure and a stop flange with the shoulder structure resisting removal of the connector assembly from the electrical box.