2 Pack, Alumiconn Aluminum To Copper Lug Connector, 3 Separate Ports To Eliminate Intermixing Of Conductors, Coats Aluminum Wires With A Thin Layer Of Silicone Sealant To Provide Resistance From Oxidation & Uses Set Screws To Break Up Surface Oxides & Provide A Secure Mechanical Connection, Approved By The Consumer Product Safety Commission, UL & Numerous Insurance Companies As A Safe Method For Aluminum Wiring Repair.