Style G - PN Kammprofile gaskets are used in confined spaces and include male and female, tongue and groove and recessed flange arrangements.
Style G - ZG is an addition of an integral outer locating ring for exact gasket positioning within the mating flange bolt circle. These are used on standard raised and flat face flange assemblies.
Style G - ZA is manufactured by replacing the outer locating ring in Style G - ZG with a loose fitting independent ring. It accounts for flange differential radial thermal expansion. These rings may be spot welded too.