AWWA C508:2009
AWWA C508:2009 Swing-Check Valves For Waterworks Service, 2-In. Through 24-In. (50-Mm Through 600-Mm) Nps Specifies only iron body, nonassisted, swing-check valves, 2-in. through 24-in. (50-mm through 600-mm) NPS, with mechanical-joint or flanged ends that are installed in approximately level settings in