Cross, 4 x KF40 flange - Superior gradeBrand new A grade KF 40 flange 4 ways Cross adapter It follows ISO KF standards and all flange size of NW 40. Matte surface finish Superior argon welding Made of Stainless steel 304 KF flange is finely polished No scratch for high vacuum integrity. You can feel quality difference between regular china cross and my high quality cross. More Info They are commonly used to build foreline vacuum plumbing and process systems. They are often called quick