Yes you have an inverted flare fitting. 3/8" is for O.D. od line, and the fitting size is usually a 5/8" or 11/16" wrench size. Some of the application specific part #'s in the Edelmann hose catalog show o-ring fitting for early 70's cars, which is totally wrong. The other end of the hose is 1/4" or 5/16" SAE.