This standard provides overall dimensions for fabricating steel water pipe fittings for sizes 6 in. through 144 in. (150 mm through 3,600 mm) for water transmission and distribution facilities and serves as a dimensional guide only. It is not intended to be a standard for wall thickness, pressure ratings, and structural or hydraulic design. Reinforcement of fittings, which may include increased wall thickness, collars, wrapper plates, or crotch plates, is not covered. The design of fittings should be made in accordance with the applicable section in AWWA Manual M11, Steel Pipe--A Guide for Design and Installation.