1. Poly [Shanghai famous brand, top ten best-selling brands in Shanghai, with a large export volume and well-known manufacturers in the pipeline industry ]

2. Xiongsu [China famous trademark, China famous brand product, pioneer in the pipeline industry ]

3. Weixing [China famous trademark, China famous brand product, listed group company in 29. Pioneer of pipeline industry ]

5. Gudi [China famous trademark, China famous brand product, joint venture group company, pioneer of pipeline industry ]

6. Baidie [Shanghai famous brand, famous trademark, Shanghai top ten brand, participating in the formulation of national standard, pioneer of pipeline industry ]

7. Zhongcai [China famous trademark, China famous brand product, listed group company, famous brand manufacturer of pipeline industry. Pioneer of pipeline industry ]

9. Boda [Shandong famous brand product, famous trademark, pioneer of pipeline industry ]

1. Rifeng [Shanghai famous brand, famous trademark, pioneer of pipeline industry]