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STD ANSI B16.9 steel elbow product specifications 1) Items: elbows 2) Wall thickness: SGP, STD, SCH40, SCH80, SCH160. and so on. 3) Size: 1/2"---72" 4)Material:A234-WPB.A420-WPL6.A234-WP12.A234-WP11...