Ret Ring With Concentric Serrations Made Of Various Types Of Metal. Used When Bolting Force Is Not Sufficient To Seal A Flat Gasket, Because It Contacts Flange Face Only At Serration Peaks. Commonly Used On Valve Bannets And Flanges Attached To Equipment.

3 Types Of Cross Section As Per Right Table Are Available:
Basic(a)
With Outer Ring(b)
With Inner And Outer Ring(c)