128 Side Outlet Elbow is a type of structure used in Pipe Rail Fittings to provide three perpendicular surfaces for guardrails, handrails, workbenches, and table supports. Based on the 90°2 Way Elbow, two sockets are extended on one side. The other vertical socket can use three pipes to form three mutually perpendicular planes. The other end of the pipe can be connected with other Pipe Rail Fittings. It is made of aluminum alloy, malleable steel, stainless steel, ductile iron, and other materials. After surface treatment, such as powder coating and galvanizing, it will have different anti-rust capabilities and appearances. It only has three fastening screws and is easy to install.