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The centering ring assemblies are placed between two KF flanges with matching outer diameters. The centering ring complete with O’ring should be used when joining with any two KF flanges with a quick clamp. They are commonly used to build foreline vacuum plumbing and process systems. We offer the KF centering ring with O’ring 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.