E-Z Lock® Duplex 90 Degree AC/MC Connector, 3/8″ Die Cast Zinc
https://dev.nsiindustries.com/product/e-z-lock-duplex-90-degree-ac-mc-connector-3-8-die-cast-zinc/
Use Bridgeport duplex 90 degree connectors to join AC/MC or FMC to an electrical box or enclosure at a 90 degree angle. Duplex design connects two lengths of conduit to a single knockout and the spring steel locking tabs snap the fitting into place.