The UR2 Connector accepts any two or three solid copper conductor combinations of 19-26AWG (0.4-0.9mm) air core or filled cable with a maximum insulation O.D. of 0.082in (2.08 mm). The wires joined can be of different wire gauges. Its three ports accept two or three conductors for butt splicing. Factory inserted sealant insulates the connections, protects against corrosion and seals out moisture.