Polaris PT2/0 Al Pin Terminal Cu Pin 2/0 AWG
https://nsiindustries.com/product/polaris-pt2-0-al-pin-terminal-cu-pin-2-0-awg/
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.