| HOBAS Pipe Hong Kong Limited | Private company limited by shares | Live |
| CHINA PIPE HOLDINGS LIMITED | Private company limited by shares | Live |
| HOME STAR PIPE FITTING CO., LIMITED | Private company limited by shares | Live |
| CHENGDE PIPE HONG KONG LIMITED | Private company limited by shares | Live |
| Chevalier Pipe Rehabilitation Hong Kong Limited | Private company limited by shares | Live |
| Hong Kong Pipe Rehabilitation Co., Limited | Private company limited by shares | Dissolved |
| HONG KONG OLD PIPE DRESS LIMITED | Private company limited by shares | Live |
| Hong Kong Kaitai Pipe Co., Limited | Private company limited by shares | Dissolved |
| GOHA PIPE (HONG KONG) CO., LIMITED | | Live |
| KYOKUTO PIPE HONG KONG LIMITED | Private company limited by shares | Dissolved |
| AQUALOK PIPE PRODUCTS HONG KONG LIMITED | Private company limited by shares | Dissolved |
| Smart Pipe (Hong Kong) Limited | Private company limited by shares | Live |
| ACORN PIPE SYSTEMS (HONG KONG) LIMITED | Private company limited by shares | Dissolved |
| UNITED PIPE (HONG KONG) COMPANY LIMITED | Private company limited by shares | Live |
| SHANGHAI HONGJIE PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI HONGJIE RIFENG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| PIPE (HONGKONG) LIMITED | Private company limited by shares | Live |
| XingYang Pipe Fittings (HongKong) Co., Limited | Private company limited by shares | Live |
| HONGKONG SHENGJIAHUA PIPE INDUSTRIAL CO., LIMITED | Private company limited by shares | Live |
| HongKong Hensun Pipe Industry Co., Limited | Private company limited by shares | Live |
| HONGKONG JINNIU PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| HONGKONG RIFENG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| HONGKONG AIKANG PIPE INDUSTRY (SHANGHAI) LIMITED | Private company limited by shares | Live |
| HONGKONG TENGDE PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| HONGKONG JINCHANG PIPE CO., LIMITED | Private company limited by shares | Dissolved |
| HONGKONG METAL PIPE CO., LIMITED | Private company limited by shares | Live |
| HONGKONG BAI AN JU PIPE OPERATION LIMITED | Private company limited by shares | Dissolved |
| HONGKONG HENGTAI TECHNOLOGY PIPE LIMITED | Private company limited by shares | Live |
| Hongkong Tianda Oil Pipe Company Limited | Private company limited by shares | Live |
| HONGKONG WEIXING PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| ZHEJIANG HUAYU PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| CHINA HUGE SPIRAL PIPE LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI HUIKE PIPE EQUIPMENT IMP & EXP CO., LIMITED | Private company limited by shares | Live |
| Saint Pipe Industrial Co., Limited | Private company limited by shares | Live |
| HK JIUZHOU RIFENG PIPE INDUSTRIES LIMITED | Private company limited by shares | Live |
| SHANGHAI NUANYA PIPE INDUSTRIES LIMITED | Private company limited by shares | Live |
| SHANDONG JINNIU PIPE INDUSTRIES LIMITED | Private company limited by shares | Live |
| SHANGHAI ZHENGYI PIPE INDUSTRIES LIMITED | Private company limited by shares | Live |
| BEST PIPE PLASTIC INDUSTRY COMPANY LIMITED | Private company limited by shares | Dissolved |
| CANGZHOU ACE PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| Cangzhou Weiheng Pipe Industry Limited | Private company limited by shares | Live |
| ZK Pipe Industry Co., Limited | Private company limited by shares | Live |
| ASME PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| RIFENG PIPE INDUSTRY (JIANGSU) CO., LIMITED | Private company limited by shares | Live |
| Sunjat Pipe Industry Co., Limited | Private company limited by shares | Live |
| HK DELIXI PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| GERMANY AIKESEN PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHU TIANLI PIPE INDUSTRY GROUP HK LIMITED | Private company limited by shares | Live |
| GUANGZHOU JINSHI PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |
| HONG KONG RI FENG PIPE INDUSTRY COMPANY LIMITED | Private company limited by shares | Dissolved |
| ZHEJIANG HUALONG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| HUANEI JINDE PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| Shenzhen Jinniu Pipe Industry Co., Limited | Private company limited by shares | Live |
| KOREA JUXIN PLASTIC PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| QINGDAO LUHONG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| HK PENGCHENG RIFENG PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| HK JINDE RIFENG PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| HK RIFENGXINYI PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHAGNHAI SANDE PLASTIC PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI BHILSA PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI CHENGZE PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI FEISHATE PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI GUOHAO PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI XINGBAO PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI YAJIE PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI HUAYUAN PIPE INDUSTRY COMPANY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI JINDE PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI LUJIE PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI MINGFENG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI PIERSA PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI RIFENG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI SHUANGJIA PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI TONGERGU PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| SHANGHAI XINYATAI PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI YILUTONG PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHANGHAI ZHENGYI PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| SHENYANG KAIDE PIPE INDUSTRY CO., LIMITED | Private company limited by shares | Live |
| SHENZHEN MD PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| HK RIFENG PIPE INDUSTRY TECHNOLOGY LIMITED | Private company limited by shares | Live |
| ZHEJIANG CHENGJIE PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| ZHEJIANG WEISHI PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| ZHEJIANG XIANGWANG PIPE INDUSTRY LIMITED | Private company limited by shares | Dissolved |
| Zhongwu Ke Pipe Industry Limited | | Live |
| QINGDAO ZHUOER PIPE INDUSTRY LIMITED | Private company limited by shares | Live |
| Pipe of Insight Limited | Private company limited by shares | Dissolved |
| INSTUBE PIPE LIMITED | Private company limited by shares | Dissolved |
| MEI YUN TAT PIPE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ASIAN PIPE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| YU YOU INTERNATIONAL PIPE CLUB LIMITED | Private company limited by shares | Live |
| ITALIAN PIPE OLD MAN INTERNATIONAL HOLDINGS LIMITED | | Live |
| Hydro Pipe International Limited | Private company limited by shares | Dissolved |
| LINED PIPE SYSTEM INTERNATIONAL GROUP LIMITED | Private company limited by shares | Live |
| INOUE PIPE MATERIAL INTERNATIONAL LIMITED | Private company limited by shares | Live |
| PETRO PIPE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| ITALY ROME PIPE INTERNATIONAL LIMITED | Private company limited by shares | Live |
| International Pipe & Steel Services Limited | Private company limited by shares | Dissolved |
| BRITAIN JOYKING PIPE INT'L GROUP LIMITED | Private company limited by shares | Dissolved |
| FRANCE OLD TOBACCO PIPE INT'L DRESS LIMITED | Private company limited by shares | Dissolved |
| PIPE (INT'L) GROUP LIMITED | Private company limited by shares | Dissolved |
| HK HUAYI LIANSU INT'L PIPE R&D LIMITED | Private company limited by shares | Live |