AWWA C508-09a-11
AWWA C508-09a-11
Addenda to ANSI/AWWA C508-09: Standard for Swing-Check Valves for Waterworks Service, 2 In. (50 mm) Through 24 In.( 600 mm) NPSAmendment by American Water Works Association, 04/01/2012
Amendment by American Water Works Association, 04/01/2012