Use 3M Scotchlok UR2 Single Core Cassette Connectors for splicing single cores and paper-insulated cores that do not need to be moisture resistant. The UR2 Single Core Cassette Connector is designed for two or three conductors with different conductor cross-sections. This solvent-resistant polypropylene connector for three conductors is suitable for copper conductors with a conductor diameter of 0.4 mm to 0.9 mm.