Polaris ASC300T 300 Mcm Alum Compression Splice(Al/Cu)
https://nsiindustries.com/product/polaris-asc300t-300-mcm-alum-compression-spliceal-cu/
Splicing conductors are the professional’s choice for making quick in-line connections and repairing damaged wiring. Use POLARIS splice connectors for bonding solid or fine stranded UL-listed wires in harsh environments.