Weifang Changsheng Pipe Co., Ltd is a professional manufacturer of ductile iron grooved pipe fittings and couplings, whose annual production capacity is more than 30,000 tons. The company covers an area of 280,000 square meter and is located in High-tech Zone, Weifang, Shandong, China, which is next to Qingdao Port.The company is ISO certified, and all the products have got FM approved and UL listed.All of these can guarantee the high quality of products.