The 2" Triclover (TC) medium solder flange is typically welded into a sidewall of a vessel where you need a port. If you're building a brewery based on the sanitary/triclover method of device attachment, you'll have these all over the place. The tube OD is 2", the flange measures 2.5", and the overall length is .9". This is the ferrule we include in our 2ETC4WF electrical enclosure kits. The length of this ferrule makes it possible to use ripple style heating elements such as the Camco and not have the foldback make contact with the ferrule. These are extremely high quality machined pieces, polished to perfection.