One has to be very careful because just about all European and Asian brake line fittings are metric and since 1980 some domestic use metric and some imperial. There are some metric that are slightly smaller than imperial and screw in too easy. To complicate matters, many parts counter people are no help what soever in this matter. To complicate matters even more NPT threads are the same in the US as well as Europe. A 1/2" pipe thread is the same on both sides of the water.
