Ruikarhop Black Insulated in-Line Splice Connector(2/0-6 Gauge,7/32 Allen Hex),CU9AL Dual Rated for Copper and Aluminum Wire,6061-T6 Aluminum,Rubber Vinyl Coating,Rated up 600v: Amazon.com: Tools & Home Improvement
Ideal 30-163 Blue Twist On Wire Connector 6 AWG to 16 AWG (15 Pcs)