2. Aikangbaoli (National Standard Participating Unit of Plastic Pipe, Top Ten Water Pipe Brands, Environmental Label Certification, High-tech Enterprise, Shanghai Famous Brand, Ai Kang Enterprise Group (Shanghai) Co., Ltd.)
3 Sorbonne (a well-known trademark in China, a designated product for the construction of China Antarctic Scientific Research Station, one of the manufacturers and suppliers of large plastic pipes, Shanghai Piersa Pipe Industry Co., Ltd.).
4 Gu Meier (a famous brand in Shanghai, recommended product of green building materials in China, advanced home decoration pipeline product, one of the leading plastic pipeline manufacturers in China, Shanghai Jinsu Industrial Co., Ltd.).
Jinde (China famous trademark, China famous trademark, Liaoning famous trademark, key high-tech enterprise, one of the most valuable brands in China, top ten brands of water pipes, Jinde Pipe Group).
6 Wei Xing (founded in 1976, a well-known trademark in China, a famous brand product in China, one of the top 500 private enterprises in China, one of the top ten brands of water pipes and a well-known brand in the industry, Wei Xing Group Co., Ltd.).
7 Rifeng (China famous brand products, China well-known trademarks, Guangdong famous brand products, one of the world's largest suppliers of new pipelines, Foshan Rifeng Enterprise Co., Ltd.)
Cai Zhong (China well-known trademark, China well-known trademark, national key high-tech enterprise, Zhejiang famous trademark, plastic pipeline professional manufacturer, Zhejiang Cai Zhong Pipeline Co., Ltd.)
9. Golden Horn (China famous trademark, China famous trademark, high-tech enterprise engaged in R&D and plastic pipe production and residential complete technology development, Wuhan Jinniu Economic Development Co., Ltd.)
10 baidie (large state-owned holding high-tech enterprise, Shanghai famous trademark, Shanghai famous brand products, top ten brands of water pipes, Shanghai baidie Pipe Technology Co., Ltd.)