Click image to view full size image
Kammprofile Gasket With Integral Outer Ring?is constructed with an integral guide ring for aligning purposes. It is suggested to be used in raised face flanges. The sealing core is designed and sized per EN-12560-6 spec and depending on the flange specification the guide ring is sized to fit properly.
link:http://www.gasket-china.com/gasket/kamprofile-gasket/ptfe-kamprofile-gasket-with-loose-grooved-face.html
Kamprofile Gasket With Loose Grooved Face