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75 100 125 150 160 200 250 PVC Wall Plastic Flange Connector Pipe Fitting Sleeve Bush Duct Ventilation Ducting Stub End Flange, Find Details and Price about Flanges DN700 Blind Flange from 75 100 125 150 160 200 250 PVC Wall Plastic Flange Connector Pipe Fitting Sleeve Bush Duct Ventilation Ducting Stub End Flange - Shandong Guolian Iron and Steel CO., Ltd.