Morris Products 97021 Insulated In-Line Splice, Black, 250 - 6 Wire Range, 5/16" Allen Hex, 4.00" Length, 1.13" Width, 2.25" Height Insulated Electrical Power Connector In-Line Splice - Black Insulated Splice for easy fast hassle free installations 6061-T6 Aluminum CU9AL Dual Rated for use with Copper and/or Aluminum wires Insulated Splice with rugged high-dielectric Rubber/Vinyl Coating Pre-Filled with Oxide Inhibitor Insulated Splice provides Easy Re-entry for changes, inspection or troubleshooting