A 1D Elbow Buttweld Fitting is a kind of pipe elbow that has a centerline radius equal to the pipe diameter, thus changing the direction of piping smoothly. Contrasting with long radius elbows, this fitting presents a much smaller turning radius and so can be used efficiently in those places where the installation is limited in space. Hindco Steel and Alloys as one of the top 1D Elbow... https://www.hindco.co.in/1d-elbow-buttweld-fitting-manufacturer-exporter-supplier-stockist.html