elliptical head The company can process DN159-7500mm,thickness 2-200mm different kinds,ellipse,dish-shaped,toper,preceded ball. elliptical head :The company has advanced production and checkout equipment,can make and process DN159-7500mm,thickness 2-200mm different kinds,ellipse of different specifications,dish-shaped,toper,preceded ball,etc,head plate products and the flat tube board,arch's tube ...