Thru wall and Floor Sealing Assembly and Fitting, Constructional Feature Watertight, Corrosion Resistant, Trade Size 3 Inch (Conduit/Steel Pipe), Outer Diameter 3.5 Inch (Conduit/Steel Pipe), Wall Thickness 8-3/4 to 16 Inch, Material Epoxy Zinc Coated Malleable/Ductile Iron (Body), PVC Coated Steel (Pressure Ring), Neoprene (Grommet), Number of Clamp Screw 4