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steel pipe reducer product specifications 1.SIZE:1/2"-48",DN15-DN1200 2.WALL THICKNESS:SCH-5S to SCH-XXS 3.STANDARD:ASME ANSI B16.9,JIS,DIN,GOST 4.MATERIAL:ASTM A234-WPB,A420-WPL6/L3etc.;ASTM A234...