E-Z Lock® Snap-in Connector Duplex 1/2″, Die Cast Zinc
https://dev.nsiindustries.com/product/e-z-lock-snap-in-connector-duplex-1-2-die-cast-zinc/
Use Bridgeport snap-in connectors to make fast, high-quality connections between AC/MC cable or flexible metal conduit and a box knockout. To install, just snap the connector into the knockout for a reliable connection – no tools required.