Flange, Flat, 4 in Nominal Pipe Size, Socket, 9 in Flange Outside Diameter, 1 3/16 in Flange Thickness, Schedule 80, Class Class 150, For Pipe Schedule 80, PVC, 150 psi Maximum Operating Pressure, 140 Degrees F, Number of Bolt Holes 8, 7 1/2 in Bolt Circle Diameter, 3/4 in Bolt Hole Diameter, 2 3/4 in Overall Length, Gray