Big diameter elbow is curved connecting pieces that join straight lengths of pipe, commonly at a 90° or 45° angle, allowing obstructions to be avoided in plumbing, ventilation, welding, and automotive applications. When the two ends differ in size, the fitting is called a reducing elbow or reducer elbow. Normally long radius elbows are used in piping as pressure loss is less as compared to short radius elbow. It required more space than short radius elbow. Applications of reducing elbow: Reducing elbows are used in a variety of applications like as follows: Hot and cold water supply facilities for public buildings Chemical, food, electronic industrial pipeline networks like pipeline networks for transporting all kinds of corrosive liquid Pipeline networks for drinking water production system such as pure water and mineral water Pipeline for air conditioning networks Compressed gas pipeline facility for industry