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ANSI B16.5 RF 300lbs ASTM A182 F51 Nps Long Welding Neck Flange, Find Details and Price about Long Welding Neck Flange Duplex Steel F60 F51 Flange from ANSI B16.5 RF 300lbs ASTM A182 F51 Nps Long Welding Neck Flange - Xingsheng Mechanical Technology Co., Ltd.