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class 300 weld neck flanges product specifications 1.SIZE: OD: 1/2” to 36” 2.CLASS: 150LB,300LB,600LB,900LB,1500LB,2500LB 3.TYPE: Weld Neck(WN) 4.MATERIAL: ASME A105, A350LF2, A182 F5,F9,F22,F304, ...