Insulated Wire Connector 3 Port 5/16 Inch Hex Pre Filled Oxide Inhibitor Multi Cable Splice Connector for CU AL Cables1[Multi Cable Splice Connector] This 3 port connector is designed for multi cable splicing, suitable for both copper and aluminum wires with a range of maximum 250 minimum #6. 2[Easy Installation] With a standard 5/16 inch hex screw connection, this insulated wire connector is easy to install, saving you time and effort. 3[Reliable Insulation Coating] Constructed with aluminum and vinyl coating, this wire connector offers excellent insulation performance that lasts, ensures reliable and safe electrical connections. 4[Prefilled with Oxide Inhibitor] The connector comes pre filled with oxide inhibitor, facilitating easy re entry for changes, inspections, or troubleshooting. Simplifies maintenance and ensures optimal performance. 5[Clearly Marked] The connector plug is clearly labeled with the maximum and minimum wire sizes, allowing for easy identification and hassle free use.