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GOST Flanges Pipe Fittings PVC Flange Adapter Flanges for PPR Tube Sheet Blind DN50 Flange, Find Details and Price about Steel Flange Stainless Steel Flange from GOST Flanges Pipe Fittings PVC Flange Adapter Flanges for PPR Tube Sheet Blind DN50 Flange - Zhejiang Jiurong Fluid Equipment Technology Co., Ltd.