180 degree elbows are used to be installed between two lengths of pipe or tube allowing a change of 180° direction,
usually these elbows distinguished by connection ends, The ends may be machined for butt welding, threaded, or socketed,
so the elbows are consist of butt weld,thread elbow. socket elbow and other series.
the material is selected accoding to the application use such as high temperature use,sanitary fitting,regular industrial use, etc