These KF-25 Tee fittings follow ISO-KF standards and have a flange size of NW-25. They are commonly used to build foreline vacuum plumbing and process systems. They are often called quick flange fittings because they are quick to assemble. ISO-KF Flange Size: NW-25 Common Dimensions: A=1.97" (50mm), B=3.94" (100mm) This is a KF-25 Tee for 3 Way splitting of Vacuum Applications especially vacuum ovens connected to a single Vacuum Pump in an array. Compatible with: general purpose and most of the foreline buliding vacuum system The material is 304 Stainless Steel with a 10^-7 torr @ 72F Vacuum Rating. Package Included: 1 piece of KF25 (NW25) Tee adapter Does not include KF-25 Clamp or O-ring these items are sold seperately.