Reducing Bushing, 1-1/2″ to 3/4″, Steel Threaded Fitting
https://hotfix.nsiindustries.com/product/reducing-bushing-1-1-2-to-3-4-steel-threaded-fitting/
Use the Bridgeport 1-1/2″ to 3/4″ Steel Reducing Bushing reduces the size of internal female threads when joining two lengths of threaded rigid or IMC conduits.