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Weld Neck Flanges , ASTM A 105, ASTM A 181, ASTM A 182, GR F1, F11, F22, F5, F9, F91, A182 F 304, 304L, 304H, 316, 316L Weld Neck Flanges Weld Neck Flanges are a very common type of pipe flanges used ...