NSIIndustries Polaris Black ISR-250 Insulated In-Line Splice Connector - 2 Ports for 250 MCM-6 AWG Wire Range - Dry Locations - Dual-rated for cooper and/or aluminum - 1.19-inch width, 1.90-inch height, 4-inch length - Hex size 5/16-inch

NSI Industries Polaris Black ISR-250 Insulated In-Line Splice Connector - 2 Ports for 250 MCM-6 AWG Wire Range - Dry Locations - Dual-rated for cooper and/or aluminum - 1.19-inch width, 1.90-inch height, 4-inch length - Hex size 5/16-inch

OHLECTRIC Dual Side Entry - 2 Port - 250-6 AWG - Black Insulated Connector - 5/16 Allen Hex - Pre-Filled with Oxide Inhibitor - Rubber/Vinyl Coating, 6061-T6 Aluminum CU9AL

(Pack of 4) AP-10201, Black Insulated in-Line Splice Connector, 2-14 Wire Range, 2.46" L x 0.83" W x 1.4" H, Pre-Filled with Oxide Inhibitor, Easy Re-Entry, Rubber Vinyl Coating, 2 Set Screws, 4-Pack