ANSI B16.9, ANSI B16.28, MSS SP-43, or MSS SP-79 Super Duplex 2507 Butt weld Pipe Fitting, Super Duplex Steel ASTM A815 Fittings, Werkstoff No 1.4410 Super Duplex Buttweld Pipe Fittings, Manufacturer Of ASTM A815 Super Duplex Steel UNS S32750 Buttweld Fittings in China.