3-1/2" Rigid Water Tight Hubs with Bonding Screw - Zinc Die Cast - Rigid Water Tight Hubs are Used To Secure Conduit in an Enclosure.3-1/2" Rigid Water Tight Hubs with Bonding Screw features include: Male Threaded Type Tapered female thread for Rigid and IMC conduit Recessed O-ring seal assures watertight connections Insulated throat and bonding locknut suitable for Service Entrance application Assembled with 105°C rated flame retardant Lexan throat insulator and BUNA-N sealing ring that completely encircles knockout to prevent contaminants from entering enclosure UL Listed and CSA Certified for use in Wet Locations Order Qty of 1 = 1 Piece Below is more info on our 3-1/2" Rigid Water Tight Hubs with Bonding Screw