King Innovation 3-Port Aluminum To Copper Lug 12-10 AWG Aluminum 18-10 AWG Copper Approved by the Consumer Products Safety Commission (CPSC) and insurance companies Secure, mechanical connection of conductors. Runs approximately 25F cooler than purple twist-ons Provides a safer connection. Separate ports eliminate intermixing of conductors One piece for easy installation. Dielectric silicone inhibitor reduces corrosion of connection Tin-plated lug and nickel-plated screws. UL 486C to meet US and Canadian standards