Set Screw EMT Connector 3″, Die Cast Zinc
https://nsiindustries.com/product/set-screw-emt-connector-3-die-cast-zinc/
Use Bridgeport set screw EMT connectors to connect electrical metallic tubing to an electrical box or enclosure. Featuring a set-screw design and locknut, these connectors create a concrete-tight seal at the point of connection.