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DN100 DN200 DN300 Quick Connection OEM/ODM Ductile Iron FM& UL Grooved Pipe Fitting Coupling for Fire Protection, Find Details and Price about Grooved Coupling Grooved Pipe Fitting Coupling from DN100 DN200 DN300 Quick Connection OEM/ODM Ductile Iron FM& UL Grooved Pipe Fitting Coupling for Fire Protection - Weifang Lulin Machinery Co., Ltd.