Bend, Carbon Steel Per ASTM A53 Grade B Type E, Standard Weight, Buttweld End, 90 Degree, Per Pipe Fabrication Institute PFI ES-24, Per ASME B16.25, 3 Diameter Radius, No Tangent each end, Welded, Marked per MSS SP 25 Carbon Steel Pipe Fittings Production Range Grade Specification Carbon Steel: ASTM/ASME A234 WPB / A860 – MSS-SP-75