Flange, Flat, 3/4 in Nominal Pipe Size, Flanged x FNPT, 3 7/8 in Flange Outside Diameter, 7/16 in Flange Thickness, 3 7/8 in Overall Length, Aluminum, Plain, Class Class 125, For Pipe Schedule Schedule 40, 125 psi @ 72 Degrees F Maximum Operating Pressure, 185 psi Max. Steam Pressure, 0 Degrees to 270 Degrees F, Number of Bolt Holes 4, 2 3/4 in Bolt Circle Diameter, 5/8 in Bolt Hole Diameter