Interchangeable, full length. These joints are machined from 18-8 type 303 free machining Stainless Steel and are supplied in accordance with CS21-58 of the N.I.S.T., O.D. and I.D. dimensions approximately the same as the glass joints listed under 7565. Shanks are machined for thread size listed and are available not threaded or machined with NPT male thread.