Expansion Joint Bolt Circle Diameter 11 3/4 in Bolt Hole Size 3/4 in Bolt Hole Threading Unthreaded Burst Pressure 656 psi Compression Distance 1/2 in Connection Type Flanged Expansion Distance 1/2 in Expansion Joint Type Convoluted Features Reinforcing Rings Flange Diameter 16 1/4 in Flange Material Ductile Iron Flange Material Grade Not Applicable For Fluid Type Acids Caustics Joint Material PTFE Joint Material Finish Not Applicable Joint Material Grade Not Applicable