King Innovation's AlumiConn aluminum to copper lug. Approved by the CPSC (Consumer Product Safety Commission), UL (Underwriter's Laboratories), and numerous insurance companies as a safe method for aluminum wiring repair. Lug style connector with three separate ports to eliminate intermixing of conductors. It coats aluminum wires with a thin layer of silicone sealant to provide resistance from oxidation, and uses set screws to break up surface oxides and provide a secure mechanical connection.