Appleton, Aluminum Die Cast, Watertight Hubs, Insulated and Gasketed, Unique Profile Permits Easy Wrenching. Smooth, Accurately Tapped Threads Facilitate Installation. Corrosion Resistant. Nema Types: 2, 3, 3R, 4, 4X, 12, 13. Used to Connect Rigid Metal Conduit or Imc to A Threqadless Opening In An Enclosure. Ul Standard: 514B, Ul Listed: E14814, E24264. E11853, Csa Standard: C22.2 No. 18.3. Csa Certified: 065178, Nema: FB-1, Trade Size 2.5 In