... large diameter gasket without guide rings).The outer guide ring serves to locate the spiral element centrally on the flange faces and prevent ... flat flange assemblies.Applications: Heat exchangers, pumps, valves, piping ...Style RIR, Inner Ring type.Suitable for male and ... female pipe flanges. Applications: Heat exchangers, pumps, valves, piping ...Style SG ,Outer Ring typeSuitable for use with flat ...