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Steel Union pipe fittings. It is available in DIN, SMS, ISO, 3A, RJT, IDF standards. Grades:ASTM A182 F304, 304L, 304H, 316, 316L, 317, 317L, 321, 310, 347, 904L, Etc. Size:1/8" NB TO 4" NB. (Socketweld & Threaded).Class:150, 300, 600, 900, 1500, 2000, 3000, 6000, 9000.