[Size]: Fit KF-40 Wing Nut Clamp.

[Quality Materials]: The centering ring is made of high quality 304 stainless steel and Buna which is durable, stable, rust and corrosive resistance and good for long time using.

[Precise Design]: The centering ring is used for connecting standard NW/KF Series vacuum components

[High Working Temp. & Wide Range of Applications]: The centering ring commonly used to build foreline vacuum plumbing and process systems. It is suitable for different media including water, gas, and oil with working at 14°F~176°F