These adapter rubber hose nozzles are KF-25 to rubber hose. The flange size follows ISO-KF standards and is NW-25. They are commonly used to make connections between ISO-KF fittings and rubber vacuum hoses. 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. They are made of Stainless Steel.
