AWWA C504:2010
AWWA C504:2010 Rubber-Seated Butterfly Valves, 3 In. (75 Mm) Through 72 In. (1,800 Mm) Sets up minimum requirements for rubber-seated butterfly valves, 3 in. (75 mm) through 72 in. (1,800 mm) in diameter, with various body and end types, for fresh water having a pH range from 6 - 12 and