... B16.9,JIS,DIN,GB,etc ISO9000:2000 carbon steel concentric reducer2/1"-48" A234WPB,A420WPL6,A234WP5,WP11,WP12,WP22 ANSI ... oil, chemical industry, water conservancy, electric power, boiler, machinery, metallurgy, sanitary construction etc.QualityISO9001 : ISO2000-Quality-Systerm has been passed .PackagingWooden ...