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250-500mm Butt Fusion Welding Machine /HDPE Pipe Welding Machine for Gas Pipes From Welping Machinery, Find Details and Price about Butt Welder Butt Welding Machine from 250-500mm Butt Fusion Welding Machine /HDPE Pipe Welding Machine for Gas Pipes From Welping Machinery - Hangzhou Welping Machinery Equipment Co., Ltd.