3 Piece union, trade size: 4 in, outside diameter: 5 1/2 in, Length: 3 3/4 in, flexibility: rigid and IMC, material: Malleable iron, connection: female threaded, standard: UL 514B, UL File number E14814, CSA C22.2 no. 18.3, CSA 065178 certified, NEMA FB 1, for connecting threaded rigid conduit and IMC
