AWWA C520:2019 pdf download AWWA C520:2019 pdf download.Knife Gate Valves, Sizes 2 In. (50 mm) Through 96 In. (2,400 mm) Users ... 12/30/2021AWWA Standards93400 mm) Knife Gate Valves Sizes 2 In. (50 mm) Through 96 In. (2Comments Read more