Most recent
AWWA C512-2015
Air Release, Air/Vacuum, and Combination Air Valves for Water and Wastewater Service
This standard describes 1/2-in. (13mm) through 6-in. (150mm) air-release valves and 1/2-in. (13-mm) through 20-in. (500-mm) air/vacuum and combination air valves having gray cast-iron or ductile-iron bodies and covers.
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AWWA: American Water Works Association [awwa]