Rigid to Enclosure Die Cast Zinc Insulated Threaded Hub 2-1/2″
https://dev.nsiindustries.com/product/rigid-to-enclosure-die-cast-zinc-insulated-threaded-hub-2-1-2/
The Bridgeport 2-1/2″ Rigid to Enclosure Die Cast Zinc Insulated Threaded Hub securely connects threaded rigid service entrance conduit to a box or enclosure. The hub features a sealing ring to prevent contaminants from entering the enclosure.