The Schematic UR Connector Conn Splice 3 Wire Pk 50.

A self stripping insulated and moistture resistant but splicing connector for 2 or 3 wire solid compper conductor combination of 0.9 – 0.4mm (19 – 26AWG) having maximum insulation O. D. of 1.52mm (0.060 inches). Commonly used to connect solid core wires in telephone systems.