Slip-Fit Screw Aluminum Entrance 1-1/4″ Cap Mast, 2″ Conduit
https://nsiindustries.com/product/slip-fit-screw-aluminum-entrance-1-1-4-cap-mast-2-conduit/
The Bridgeport Slip-Fit Screw Aluminum Entrance 1-1/4″ Cap Mast, 2″ Conduit serves as a connection point for rigid or IMC service entrance wires. This threaded type entrance cap features two holes with 7/16″ dia or three holes with 5/8″ dia.