Inverted flare 45* elbows are used on hydraulic brake, transmission and fuel lines as well as LP gas lines to connect tubing to mating fittings. The internal inverted flare creates a strong metal to metal seal and the male pipe thread threads into internally threaded mating fittings. They come in alternating tube/pipe sizes depending on the application. They come in alternating tube/pipe sizes depending on the application. They are made of brass for high corrosion resistance and can withstand up to 2,800 PSI. Used on copper, brass and steel tubing.