- Hebei Xuji Trade Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Tianjin Guoying Industry & Trade Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- F-Moto Machinery Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Xinghua Suyuan Jingwei Pipe Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Anhui Quanchai Engine Co., Ltd. OBO Pipe Factory
- Main business:
- Caribbean RegionBermuda
- Shandong Huabao Steel Pipe Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Hebei Jitie Group Company
- Main business:
- Caribbean RegionBermuda
- Hunan Great Steel Pipe Co., ltd.
- Main business:
- Caribbean RegionBermuda
- Shandong Tongjia Machinery Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Shandong Jialong Petroleum Pipe Manufacture Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Zhuji Yiba Heat Insulator Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Yuyao Lvdao Plastic & Rubber Machinery Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Zhengzhou Zhongbao Steel Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Hebei Bohong Rubber Belts Manufacturing Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Hebei Zhonghai Steel Pipe Manufacturing Corporation
- Main business:
- Caribbean RegionBermuda
- Shenzhen Jiajie Plastic & Silicone Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Qingdao Skysun International Trade Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Shandong Liaocheng Zhongxing Steel Pipe Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Shanghai Yichen Industrial Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Cangzhou Leader Trading Co., Ltd.
- Main business:
- Caribbean RegionBermuda