Mighty-Align® EMT Slip Coupling 3-1/2″, Zinc, Easy Installation
https://nsiindustries.com/product/mighty-aligna-emt-slip-coupling-3-1-2-zinc-easy-installation/
The Bridgeport 3-1/2″ Mighty-Align Slip Coupling ensures a secure connection between two lengths of EMT conduit. The coupling comes with tri-drive set screws to keep both ends of the EMT conduit locked in place.