Abstract: A connector (100) in accordance with the present invention comprises a dielectric enclosure (102) having a plug receiving cavity (104) open to the front of the enclosure, and a wall (106) forming one wall of the cavity. The top wall includes an interior cavity surface (130), a front surface (124), and an exterior surface (134). On its front surface are a plurality of parallel first grooves (126) extending from associated orifices (128) to the cavity surface, and at least one second groove (132) extending from the exterior surface to the cavity surface, forming a groove end (136) open to the exterior surface (134). The second groove is for positioning a spare spring contact (242) carried by an adapter (200). Spaced flanges (140), projecting from the wall, define with the exterior surface an adapter-receiving channel (142). The channel includes latching slots (150) and guiding ribs (146) for snap-mounting the adapter.