This adapter is used to convert a KF25 NW25 size ISO-KF vacuum flange to a 1 inch outer diameter pipe compression fitting. The compression fitting can be tightened by hand and features compression connect for pipe insertion. The vacuum seal occurs by compression of a Viton O-ring and is easily removable to replace.

The ISO-KF flanges 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 (please see top right figure - click to enlarge). 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. The OD of the pipe fitted into the compression port is between 0.5, 0.75, 1.0, 1.125, or 1.5 inches depending on the size ordered. They are made of Stainless Steel.