| DUCT ZONE LIMITED | Private company limited by shares | Live |
| XUZHOU EVERBRIGHT SINSING DUCTILE IRON PIPES CO., LIMITED | Private company limited by shares | Live |
| BENXI BEITAI DUCTILE CAST IRON PIPES TRADING CO., LIMITED | | Live |
| GUANGDONG AOXINYU DUCTILE IRON PIPES CO., LIMITED | | Live |
| DUCTILE INVESTMENT COMPANY LIMITED | Private company limited by shares | Live |
| DUCTMASTER AIR CLEANING LIMITED | Private company limited by shares | Dissolved |
| PERFECTA DUCTS MANUFACTURING CO. LIMITED | Private company limited by shares | Dissolved |
| TECHNIC DUCTS LIMITED | Private company limited by shares | Dissolved |
| DUCTUS COMPANY LIMITED | Private company limited by shares | Dissolved |