3/4″ Steel Screw-on Raintight EMT Coupling
https://testing.nsiindustries.com/product/3-4-steel-screw-on-raintight-emt-coupling/
The Bridgeport 3/4″ Raintight Zinc-Electroplated Steel EMT Compression Coupling used to join two lengths of EMT conduit creates a concrete-tight, watertight seal and long-lasting fit in a wet location.