Ningbo yonghan metal manufactural factory is a specializing development \design \ manufactural steel stainless bellows \hoseand ripple compensator gas pipe oven accessories part and extend part products by body company ,which own a team of experienced professionals in bellows hose advanced production techniques and first rate design and manufactural quality ability and has first class team,we give a service and supply parts by customer requirement ,in beginning ,we has fond a system of ISO9001:2008,TS16949