| HO WAI WATERPIPE CO., LIMITED | Private company limited by shares | Live |
| SUM KEE WATER-PIPE DRAINAGE LIMITED | Private company limited by shares | Dissolved |
| LEE SUM KEE WATER-PIPE DRAINAGE LIMITED | Private company limited by shares | Live |
| KONG'S WATER-PIPE ENGINEERING LIMITED | Private company limited by shares | Live |
| Wing Lik Waterpipe Engineering Limited | Private company limited by shares | Live |
| On Ying Water-Pipe Engineering Limited | | Live |
| HONG HONG WATERPIPE LIMITED | | Live |
| Giant Spring Waterpipe Engineering Company Limited | Private company limited by shares | Live |
| Waterpipeplus (HK General Agent) Co. Limited | Private company limited by shares | Live |
| WATERPIPEPLUS (HKD12) COMPANY LIMITED | Private company limited by shares | Live |
| Waterpipeplus (HKI07) Co. Limited | Private company limited by shares | Live |
| WaterpipePlus (HKK02) Co. Limited | Private company limited by shares | Live |
| WaterpipePlus (HKL07) Co. Limited | Private company limited by shares | Live |
| WATERPIPEPLUS (HKM01) LIMITED | Private company limited by shares | Live |
| Waterpipeplus (HKO06) Co. Limited | Private company limited by shares | Live |
| Waterpipeplus (HKQ14) Co. Limited | Private company limited by shares | Live |
| WATERPIPEPLUS (HKR05) LIMITED | Private company limited by shares | Live |
| KEUNG KEE WATER-PIPES & DRAINAGE SERVICE ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |