Flange Flat 1 1/4 in Nominal Pipe Size Socket 4 5/8 in Flange Outside Diameter 9/16 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 4 3 1/2 in Bolt Circle Diameter 1/2 in Bolt Hole Diameter 1 7/16 in Overall Length Gray