Expansion Joint Bolt Circle Diameter 8 1/2 in Bolt Hole Size 3/4 in Bolt Hole Threading Unthreaded Burst Pressure 552 psi Compression Distance 1 in Connection Type Flanged Expansion Distance 1 in Expansion Joint Type Convoluted Features Reinforcing Rings Flange Diameter 13 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