- Xuzhou Desheng Petrol Machine Parts Co.,Ltd.
- Main business:
- Caribbean RegionBermuda
- Hebeijinsheng pipe fitting manufacturing co,ltd.
- Main business:
- Caribbean RegionBermuda
- Enti Pipeline
- Main business:
- Caribbean RegionBermuda
- DONG WOO E&C CO.,LTD.
- Main business:
- Caribbean RegionBermuda
- shanghai metalgoods pipefittings co ltd
- Main business:
- Caribbean RegionBermuda
- Runhong Construction Machinery Manufacture Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Hebei AoYin Trading Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Baoji TaiRong Metal Material Techonlogy Co., LTD.
- Main business:
- Caribbean RegionBermuda
- cangzhou longsheng pipeline equipment co.,ltd
- Main business:
- Caribbean RegionBermuda
- Shaanxi Huachuang Non-ferrous Metal Technology Co., Ltd.
- Main business:
- Caribbean RegionBermuda
- Hebei New sinda pipes Qingdao Manufacture Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Shijiazhuang Baoguan Pipe Fitting Co., Ltd
- Main business:
- Caribbean RegionBermuda
- Shanghai Unite Steel Trading Co.,LTD
- Main business:
- Caribbean RegionBermuda
- Wuxi OFD Oil-Field Supply Co.,Ltd.
- Main business:
- Caribbean RegionBermuda
- Yuanen Fluid Equipment Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Cangzhou Spiral Steel Pipes Group CO.,Ltd
- Main business:
- Caribbean RegionBermuda
- Cangzhou Metanland co.,Ltd
- Main business:
- Caribbean RegionBermuda
- jinan shuangke co.,ltd
- Main business:
- Caribbean RegionBermuda
- Hebei pipe fittings Co.,Ltd
- Main business:
- Caribbean RegionBermuda
- Hunan Great steel pipe Co
- Main business:
- Caribbean RegionBermuda