Polaris PT750 Al Pin Terminal Cu Pin 750 MCM
https://www.nsiindustries.com/product/al-pin-terminal-cu-pin-750-mcm/
These copper pin aluminum connectors are rated for aluminum conductors with a pigtail type copper pin designed to facilitate termination of aluminum conductors into copper connectors. The POLARIS compression design creates a permanent, vibration-resistant connection that you can rely on with low contact resistance.