Polaris 3/0-6 AWG Insulated Tap Connector, Black IT-3/0B - The Home Depot
Amazon.com: NSI Industries Polaris Black IPL3/0-3B Insulated Multi-tap Connector - 3-Port Single-Sided Entry for 3/0-6 AWG Wire Range - Dry Locations - Dual-rated for cooper and/or aluminum - 1.6-inch width, 1.8-inch height,
NSI Polaris™ IPLD500-4 IPLD Double Sided Entry Insulated Multi-Tap Connector, 4 AWG to 500 kcmil Aluminum/Copper Conductor, Plastisol | State Electric
NSI Polaris Insul-Tap Connector, for Two Wires and in-Line Splicer/Reducer, ISR Series, 250-6 AWG Wire Range, 4.00" x 1.19" x 1.90", Pack of 4: Screw Terminals: Amazon.com: Industrial & Scientific