EMT Coupling 4″, Zinc, Concrete Tight with Tri-Drive Screws
https://nsiindustries.com/product/emt-coupling-4-zinc-concrete-tight-with-tri-drive-screws/
The Bridgeport 4″ Zinc 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.