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Product Description These Tee Reducer KF-40 to KF-25 fittings follow ISO-KF standards and have a flange size of NW-40 to NW-25. They are commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble. A circumferential clamp and centering ring form the vacuum seal between the connecting flanges. The centering ring contains a rubber elastomer o-ring. The standard sizes for quick flange fittings are KF-10, KF-16, KF-25, KF-40, and KF-50 with flange sizes NW-10, NW-16, NW-25, NW-40, and NW-50, respectively. They are made of corrosive resistant stainless steel. Low price with high quality! With our competitive pricing and finishing time, we are confident that we can underbid other online/offline scientific vacuum instruments vendors.Tee Reducer ISO-KF Flange Size: NW-40 to NW-25 •Reducer tees adapt two different flange sizes •Vacuum Fitting •304 Stainless Steel Both end KF-40 (NW-40) flange, middle KF25 flange Made of Stainless Steel 304 KF40 - KF40 End to End is 130mm Middle KF25 flange langth is 65mm Reasonable prices optional vacuum partsNotice: 1. The colors may have difference due to the different display and camera, pls understand. 2. The shipment will be arranged in 1-3 working days (not including customized product), and takes about another 3-9 working days to reach you.