To Whom It May Concern: We hereby certify that to the very best of our knowledge and belief all Schedule 40 Butt-Weld Stainless Steel Pipe Fittings provided by MSI are manufactured in accordance to specification(s) ASTM A403, ASME SA403/SA403M. Dimensions of Schedule 40 Butt-Weld Stainless Steel Pipe Fittings provided by MSI are in accordance with ANSI B16.9, B16.28 and MSS SP-43. The material from which all Schedule 40 Butt-Weld Stainless Steel Pipe Fittings provided by MSI is manufactured from is in accordance with A312. Sincerely, MSI Quality Assurance 3940 Swenson Avenue ◊ St. Charles, Illinois ◊ 60174 800-678-2455 ◊ 800-678-0857 fax ◊ www.msi-products.com