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products Slip-On Flange Material Grade Gr1 Gr2 Gr3 Gr4 GR5 Gr7 Gr9 Gr11 Certification ISO9001:2008 Alibaba.com Assessed Supplier Standard ANSI B16.5 ASTM B16.5 ASME B16.47 JIS B2220 DIN2627-2628 AWWA ...