Mighty-Bite® PUSH-EMT® Raintight Insulated Connector 3/4″, Zinc
https://dev.nsiindustries.com/product/mighty-bite-push-emt-raintight-insulated-connector-3-4-zinc/
The Bridgeport 3/4″ EMT Raintight Insulated Connector is used to establish a raintight or wet location seal between EMT and a box device, panelboard, or similar electrical enclosure. Push-on installation makes this fitting easy to install and remove.