Conduit Sealing Bushing, Conduit Size 3-1/2 Inch, 4 Inch, Pipe Size 4 to 4.5 Inch (Steel Pipe), 3.6 to 3.96 Inch (Cast Iron Pipe), Outer Conduit Diameter 6.065 Inch, Core Drilled Hole 6 Inch, Material PVC Coated Steel Pressure Disc, Used On Pipe, Conduit and Tubing