Insulated Set Screw EMT Connector 4″, Zinc Plated Steel
https://dev.nsiindustries.com/product/insulated-set-screw-emt-connector-4-zinc-plated-steel/
Use Bridgeport set screw EMT connectors to connect electrical metallic tubing to an electrical box or enclosure for a concrete-tight seal at the point of connection. An insulated throat protects inner wiring up to a temperature of 105°C.