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Centering Ring KF-16 Vacuum Fittings, ISO-KF Flange Size NW-16, Aluminum & Buna O-Ring (lot of 1pcs): Amazon.com: Industrial & Scientific
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810001, Centering Ring, NW100, ISO LF, Large Flange, Fluorocarbon-based fluoroelastomer (FKM / FPM), 304ss | MDC Precision | MDC Precision
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