Centering Ring KF 25 With Viton® O-Ring, KF 25 (NW 25), Stainless Steel, The centering ring contains a rubber elastomeric o-ring. Those are also recognized as NW10, NW16, NW25, NW40, or KF-10
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Stainless Steel Centering Ring Kf16-Kf50 Vacuum Fittings & O-Ring - China Stainless Steel Fitting, Centering Ring | Made-in-China.com
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