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The centering ring assemblies are placed between two ISO flanges with matching outer diameters. The centering ring complete with O’ring should be used when joining with any two ISO flanges with a quick clamp. They are commonly used to build foreline vacuum plumbing and process systems. Our’s ISO centering ring have two area used size, one is U.S.A and another is Europe. We offer the centering rings with o’ring –Europe are used for foreline vacuum plumbing and for simple high vacuum(HV) chamber ports andthey also application vacuum industry standard for ultra-high vacuum applications.