The gaskets covered by this specification are intended for use in military applications where their performance characteristics are required. The gaskets are suitable for installation in military systems when used within the limitations of their specified performance requirements. These gaskets are not to be used with cover-choke flange combinations. The gaskets specified herein must function in and withstand for prolonged periods worldwide military unique environments. These gaskets are military unique because expensive changes to field systems would be required to maintain proper form, fit and function, if other than these standard military components are used.