Flange Flat 1 in Nominal Pipe Size Female NPT 4 1/4 in Flange Outside Diameter 1/2 in Flange Thickness Schedule 80 Class Class 150 For Pipe Schedule 80 CPVC 150 psi Maximum Operating Pressure 210 Degrees F Number of Bolt Holes 4 3 1/8 in Bolt Circle Diameter 9/16 in Bolt Hole Diameter 1 1/8 in Overall Length Gray