3-1/2" Rigid Water Tight Hubs - Zinc Die Cast - Rigid Water Tight Hubs are Used To Secure Conduit in an Enclosure.3-1/2" Rigid Water Tight Hubs features include: To secure threaded Rigid Service Entrance conduit IMC to box or enclosure in a WaterTight Application Assembled with 221deg;F (105deg;C) rated flame retardant Lexan throat insulator and BUNA-N sealing ring that completely encircles knockout to prevent contaminants from entering enclosure For use in Wet Locations cULus Listed Order Qty of 1 = 1 Piece Below is more info on our 3-1/2" Rigid Water Tight Hubs