Polaris IPL1/0-6 1/0-14 Awg Polaris Insulated Multi-Tap Conn 6 Port (Single Sided Entry)
https://www.nsiindustries.com/product/6-port-black-multi-tap-pre-insulated-connector-1-0-14-gauge/
Polaris Black Multi-Tap Connectors form secure connections between multiple conductors with a rounded design and UV-resistant insulation coating. Installs with a hex key and torque wrench, with no need for cover and taping.