Van Stone Flange Raised 1 in Nominal Pipe Size Female NPT 4 1/4 in Flange Outside Diameter 5/8 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 1/8 in Bolt Circle Diameter 9/16 in Bolt Hole Diameter 1 3/8 in Overall Length Gray