Expansion Joint, Bolt Circle Diameter 6 in, Bolt Hole Size 3/4 in, Bolt Hole Threading Unthreaded, Burst Pressure 600 psi, Compression Distance 1 3/4 in, Connection Type Flanged, Expansion Distance 3/4 in, Expansion Joint Type Single Bulb, Features Metal Collar Cast into Retaining Ring, Molded Integral Flange, Flange Diameter 7 1/2 in, Flange Material Steel, Flange Material Finish Not Applicable, Flange Material Grade Not Applicable, For Fluid Type Not Applicable, Joint Material Neoprene