Thomas & Betts H100-TB Hub Connector. T&B Hub Connector, 1 in, For Use With: Rigid/IMC Conduits, Zinc, 2 in W x 1-13/16 in H. Additional Description: TB -H100-TB 1 INCH ZINC CONDUIT HUB. Catalog Description: 1 Inch Zinc Hub Connector with Thermoplastic Insulating Throat, Sealing Ring Nitrile (BUNA-N) for Use with Rigid/IMC Conduit.