Morris Products 93236 Long Barrel Compression Splice, Aluminum, Black Color Code, 600mcm Wire Range Aluminum Long Barrel Compression Splices - Aluminum Compression Splices are Dual Rated for use with both Copper & Aluminum Conductors Aluminum Compression Splices are AL9CU Dual Rated & accept both Aluminum and Copper conductors Connector Barrels are coated with Oxide Inhibitor & capped Center Stop assures Proper Cable Installation Made of High-Conductivity Seamless Aluminum