3-1/2" standard watertight hubs are used with 3-1/2" threaded rigid or IMC conduits to connect and bond them to threaded openings in boxes or enclosures. Garvin Industries' die cast zinc watertight hubs may be used in both wet and dry locations. Garvin Industries' watertight hubs have a rugged metallic construction to ensure mechanical protection and durability. The watertight hubs also have an insulated throat to protect wires and reduce the effort of pulling wires. Garvin Industries' watertight hubs also feature an O-ring to provide a rain-tight seal on electrical boxes or enclosures.