Abstract: A connector is described which provides moisture proof sealing and electrical grounding of selected contacts, especially for coaxial contact devices. The connector includes a conductive shell assembly (20, FIG. 4 ) with a rear wall (40) that has a large opening (42) therein. An insulator device (50) lies in the shell assembly and at least one coaxial contact device (52) lies in the insulator device. A ground plane (60) formed by a sheet of electrically conductive material has an outer portion (62) trapped between the insulator device and the rear wall of the shell assembly, and has an inner portion (63) that directly engages the outer contact of the coaxial contact device to ground it. The shell assembly includes front and rear tubular shell parts (32, 34), with the tubular rear shell part having a greater inside width and length than that of the front tubular shell part.