AWWA C228( -14) - Stainless-Steel Pipe Flange Joints for Water is 2 In. AWWA C507( -15) - Ball Valves, 6 In. AWWA C508( -09) - Swing-Check Valves for Waterworks Service, 2-In. AWWA C516( -14) - Large-Diameter Rubber-Seated Butterfly Valves, Sizes 78 In.