Bridgeport 231 3/4 Set Screw Conn. Steel, Box of 25
https://nsiindustries.com/product/set-screw-emt-connector-3-4-zinc-plated-steel/
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.