Polaris IPLD350-5 350 Mcm – 6 Awg Polaris Insulated Multi-Tap Conn 5 Port (Dual Sided Entry)
https://nsiindustries.com/product/5-port-black-multi-tap-pre-insulated-connector-350-mcm-10-awg-2/
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.