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Common Dimensions: A = 4.80" (122mm), B = 2.30" (58mm), Both Ends KF-40 (NW40) to Middle KF-25 (NW25) These Tee Reducer KF-40 to KF-25 fittings follow ISO-KF standards and have a flange size of NW-40 to NW-25 KF Flanges are ideal for high vacuum applications requiring frequent assembly and disassembly. Elastomer seals are reusable and allow for fast assembly he KF (QF) flange is used for through- or foreline vacuum plumbing and for simple HV chamber ports Material: Stainless Steel