Appleton UNILETS Sealing Hub, Size: 3 X 4 IN, Material: Malleable Iron, Finish: Triple-Coat (Zinc Electroplate, Chromate And Epoxy Powder Coat), Connection: Tapered MNPT X Tapered FNPT, Cubic Capacity: 33.7 CU-IN, Length: 5 IN, Height: 5-1/4 IN, Standard: UL 886 (1203), UL File Number E10444, CSA C22.2 No. 30, CSA 065181, UL Listed For Class I, Groups B, C, D, Class II, Groups E, F, G, And Class III, For Use With Threaded Rigid Metal Conduit and IMC