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AWWA C518-2024
Double-Disc, Swing-Check Valves for Waterworks Service, 2 In. Through 48 In. (50 mm Through 1,200 mm) NPS
The purpose of this standard is to provide the minimum requirements for double-disc swing-check valves, suitable for waterworks service, 2-in. through 48-in. (50-mm through 1,200-mm) NPS, including materials and testing.
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AWWA: American Water Works Association [awwa]