Flange member, noice silencer, tube end closure or connection device, and forming method and device.
法兰部件，消声器，管端闭锁或联结装置及其形成方法和装置。
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Cangzhou Yongwang Pipeline Manufacturing Co., Ltd. is a manufacturer of Elbow, Tee, Reducer, Flange, Tube Top Cap Closure Products all kinds of Pipe f.