Rigid, EMT or IMC Conduit Clamp-On Aluminum Entrance Cap 1″
https://nsiindustries.com/product/rigid-emt-or-imc-conduit-clamp-on-aluminum-entrance-cap-1/
The Bridgeport 1″ Rigid, EMT or IMC Conduit Clamp-On Aluminum Entrance Cap serves as a connection point for service entrance wires. This clamp-on type entrance cap features two 7/16″ dia holes or three 1/2″ dia holes.