- Ze Valve Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- KWK Steel Co.,Ltd.
- Main business:
- Caribbean RegionBermuda
- Zhejiang Fcvalve Manufacture Co,.Ltd.
- Main business:
- Caribbean RegionBermuda
- Mengcun Hui Autonomous County Tianyuan Pipe Fitting Co., Ltd
- Main business:
- Caribbean RegionBermuda
- Penglai Shuicheng Cast Stone Pipe Valve Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Zhengzhou Huitong Pipe Fittings Co
- Main business:
- Caribbean RegionBermuda
- Tianjin Sino-Sky Steel Trading Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Xingtai Golden Kide Industry & Trade Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Tianjin DALIPU OIL COUNTRY TUBULAR GOODS Company
- Main business:
- Caribbean RegionBermuda
- Ningbo New-era steel Tube Co.,Ltd.
- Main business:
- Caribbean RegionBermuda
- Hunan Great Steel Pipe Co,.Ltd
- Main business:
- Caribbean RegionBermuda
- tianjin city leixin steel trade co.,ltd
- Main business:
- Caribbean RegionBermuda
- Huamao Steel Pipe Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- China Zhonghai Steel Pipe Manufacture Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Tianjin Huilitong Steel Tube Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Zhengzhou Huitong Pipe Fitting Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Hunan Shinestar Great steel group
- Main business:
- Caribbean RegionBermuda
- Tianjin Zhongshun Petroleum Steel Tube CO.,LTD
- Main business:
- Caribbean RegionBermuda
- Tianjin Zhongshun Petroleum Steel Pipe Co.,Ltd.
- Main business:
- Caribbean RegionBermuda
- Tianjin Haohong weiye Steel Trading Co., Ltd
- Main business:
- Caribbean RegionBermuda