Polaris IPLM4-4 4-14 Awg Polaris Insulated Multi-Tap Conn 4 Port (Single Sided Entry & Mountable)
https://nsiindustries.com/product/4-port-black-mountable-pre-insulated-connector-4-14-gauge/
Polaris Black Multi-Tap Mountable 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.