A Compression Fitting FTA Brass Elbow is a type of pipe fitting used to connect two pipes or tubes together. It is made of brass and is used in plumbing applications. The FTA stands for Female Threaded Adapter. It has a female threaded end on one side and a compression fitting on the other side. The compression fitting is used to connect the pipe or tube to the elbow. The brass construction makes it durable and resistant to corrosion.