Shanghai Topsun Industrial Co., Ltd. (hereinafter referred to as Topsun) was founded in 2007 and is a company specializing in the research and sales of pipeline supporting products such as ductile iron pipes and fittings. The products cover ductile iron pipes and fittings, steel pipes and fittings, PVC pipes, PE pipes and fittings, valves, water meters and manhole covers, etc. The application fields involve water supply and drainage, construction, fire protection and irrigation industries.