Use the Bridgeport 154-DC 1-1/4" Rigid to Enclosure Die Cast Zinc Insulated Threaded Hub to secure threaded rigid service entrance conduit to a box or enclosure. A BUNA-N sealing ring completely encircles the knockout and creates a concrete-tight seal to prevent contaminants from entering the enclosure. Made from zinc, the hub is ideal for long-term use in most environments. The hub features an insulated throat rated up to 105°C. This threaded hub meets Nema Standard: FB-1 and UL Standard: UL-514B and is listed for use with aluminum and steel rigid conduit.