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KF are ISO standard vacuum fittings and have a flange size of KF-10, KF-16, KF-25, KF-40, KF-50.
They are commonly used to build foreline vacuum plumbing and process systems.
It is consists of two KF flanges, a centering ring with O-ring and a clamp. High vacuum tight KF connections
can be made without the use of tools simply by turning the wing nut of the clamp.
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