Bridgeport 246 2 1/2 IN Set Screw Cplg. Steel, Box of 2
https://nsiindustries.com/product/emt-coupling-2-1-2-steel-concrete-tight-with-tri-drive-screws/
The Bridgeport 2-1/2″ Steel Coupling ensures a secure connection between two lengths of EMT conduit. The seal is concrete tight when taped. The coupling comes with tri-drive set screws to keep both ends of the EMT conduit locked in place.