1. A corrugated metal gasket for use between two flanges, said corrugated metal gasket being produced by a method comprising the following steps:
providing an annular gasket substrate; and
machining into said annular gasket substrate a plurality of substantially uniform and generally concentric corrugations.
2. The corrugated metal gasket of claim 1 which further includes an outer guide ring
3. The corrugated metal gasket of claim 2 wherein said outer guide ring is integrated with said annular gasket substrate as a unitary corrugated metal gasket