Review on Stop Shop Inverted Fittings Threads by Sean Baller

is uncommon. They have almost standard brake line threads but they don't like being tightened all the way without getting rough If you tighten them to normal specs they will definitely leak and suck air into your braking system but tightening them up while 3 lines are installed without destroying your fittings or lines is quite a challenge so the must Threads cleaned. It is recommended that the lines be fully installed, re-threaded and then disassembled for re-assembly in the car.