Polaris IPLD250-3C Polaris Vision Tap (Clear) 250 Mcm – 6 Awg Polaris Insulated Multi-Tap Conn 3 Port (Dual Sided Entry)
https://nsiindustries.com/product/3-port-clear-multi-tap-pre-insulated-connector-250mcm-6-awg/
Polaris Vision Tap Multi-Tap Connectors form secure connections between multiple conductors with a transparent rounded design and chemical-resistant insulation coating. Installs with a hex key and torque wrench, with no need for cover and taping.