Flange with EPDM Seal 10 in Nominal Pipe Size Grooved 10 3/4 in Flange Outside Diameter 1 in Flange Thickness Ductile Iron Zinc Plated Class Class 150 300 psi Maximum Operating Pressure -20 Degrees to 180 Degrees F Number of Bolt Holes 12 14 1/4 in Bolt Circle Diameter 1 in Bolt Hole Diameter