Flange, 1/2 in Nominal Pipe Size, Socket, 3 1/2 in Flange Outside Diameter, Schedule 80, Class Class 150, For Pipe Schedule Schedule 80, Polyvinylidene, 150 psi Maximum Operating Pressure, 73 Degrees to 280 Degrees F, Number of Bolt Holes 4, 2 3/8 in Bolt Circle Diameter, 5/8 in Bolt Hole Diameter, 3 3/8 in Overall Length, Red