Ductile Iron Fitting: Adptor Qingdao Huizhong Industry Co., Ltd. Base Info Standard:ISO2531Material:IronConnection:FlangeSurface Treatment:Black OxideHead Type:RoundOrigin:China Description Pre:Ductile Iron Fitting Next:DIN934 Grade 4.8 8.8 10.9 Hex Nut Hexgon Nut Zinc Plated