Mighty-Bite® PUSH-EMT® Connector 1/2″, Zinc, Easy Installation
https://nsiindustries.com/product/mighty-bite-push-emt-connector-1-2-zinc-easy-installation/
The Bridgeport 1/2″ PUSH-EMT Connector is used to establish a secure connection between a length of EMT and a box device, panelboard, or similar electrical enclosure. Push-on installation makes this fitting easy to install and remove.