| Professional Drainage & Plumbing (HK) Limited | Private company limited by shares | Live |
| PROMOTION PLUMBING AND DRAINAGE ENGINEERING LIMITED | Private company limited by shares | Live |
| RIDGID PLUMBING LIMITED | Private company limited by shares | Live |
| SANG HOP PLUMBING COMPANY, LIMITED | Private company limited by shares | Dissolved |
| TAI SANG ELECTRICAL & PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| TAI SANG ELECTRICAL & PLUMBING COMPANY LIMITED | Private company limited by shares | Live |
| Hoi Sang Plumbing Engineering Limited | | Live |
| KAM SANG PLUMBING ENGINEERING LIMITED | | Live |
| KIN SANG METALS & PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| ADRIEN EST PLUMBING AND SANITARY FITTINGS CO., LIMITED | Private company limited by shares | Live |
| FAR EAST SANITARY AND PLUMBING LIMITED | Private company limited by shares | Dissolved |
| WANG MEI PLUMBING AND SANITARY FITTINGS CO., LIMITED | Private company limited by shares | Live |
| HK GUOJIANGLONG PLUMBING SANITARY WARE CO., LIMITED | Private company limited by shares | Live |
| KIN SHING PLUMBING & SANITARY WARE COMPANY LIMITED | Private company limited by shares | Live |
| CHAN YEE KEE PLUMBING & SANITARY WARE CO., LIMITED | Private company limited by shares | Live |
| HK HANBA PLUMBING SANITARY WARE LIMITED | Private company limited by shares | Dissolved |
| WANSION PLUMBING & SANITARY WARE LIMITED | Private company limited by shares | Live |
| KIN YIP PLUMBING & SANITARY WORKS LIMITED | Private company limited by shares | Dissolved |
| EC PLUMBING SERVICES CO., LIMITED | Private company limited by shares | Live |
| WAI KEE PLUMBING & ELECTRICAL SERVICES LIMITED | Private company limited by shares | Live |
| A&S Electrical & Plumbing Services Limited | Private company limited by shares | Live |
| MING FAI ELECTRICAL & PLUMBING SERVICES LIMITED | Private company limited by shares | Live |
| HONG LEE PLUMBING SERVICES LIMITED | Private company limited by shares | Live |
| Raising Plumbing Services Company Limited | | Live |
| V-Flow Plumbing Services Limited | Private company limited by shares | Live |
| LONG SHEK PLUMBING LIMITED | Private company limited by shares | Live |
| WAN SHING PLUMBING COMPANY LIMITED | Private company limited by shares | Dissolved |
| KIN SHING PLUMBING & DRAINAGE COMPANY LIMITED | Private company limited by shares | Live |
| PAK SHING PLUMBING & ENGINEERING LIMITED | Private company limited by shares | Live |
| KIN SHING PLUMBING & ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| SHING LOK PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Live |
| Ming Shing Plumbing Engineering Limited | Private company limited by shares | Live |
| PAK SHING PLUMBING ENGINEERS LIMITED | Private company limited by shares | Dissolved |
| HANG SHING PLUMBING & DRAINAGE LIMITED | Private company limited by shares | Dissolved |
| HING SHING PLUMBING ENGINEERING COMPANY LIMITED | Private company limited by shares | Dissolved |
| KEUNG SHING PLUMBING WORKS LIMITED | Private company limited by shares | Dissolved |
| SINCERE PLUMBING INDUSTRIAL LIMITED | Private company limited by shares | Dissolved |
| HANG SING PLUMBING & ELECTRICAL LIMITED | Private company limited by shares | Live |
| LONG SING PLUMBING LIMITED | Private company limited by shares | Live |
| SING KAU PLUMBING WORKS LIMITED | Private company limited by shares | Dissolved |
| HAP SING PLUMBING WORKS LIMITED | Private company limited by shares | Live |
| Sintat Plumbing and Drainage Eng. Limited | Private company limited by shares | Live |
| SKYWELL PLUMBING LIMITED | Private company limited by shares | Live |
| SPLENSSAY PLUMBING (CHINA) LIMITED | Private company limited by shares | Dissolved |
| UNITED PLUMBING & STEEL WORKS LIMITED | Private company limited by shares | Dissolved |
| SUNWAY PLUMBING LIMITED | Private company limited by shares | Live |
| PLUMBING SUPPLIES LIMITED | Private company limited by shares | Dissolved |
| MAN CHUEN PLUMBING SUPPLIES COMPANY LIMITED | Private company limited by shares | Dissolved |
| HONEST PLUMBING SUPPLY CO., LIMITED | Private company limited by shares | Live |
| NEW TALENT PLUMBING AND DRAINAGE LIMITED | Private company limited by shares | Dissolved |
| BUSINESS TECHNOLOGY (PLUMBING AND DRAINAGE) COMPANY LIMITED | Private company limited by shares | Live |
| TOUGH PLUMBING ENGINEERS LIMITED | Private company limited by shares | Live |
| TUNG ON PLUMBING COMPANY, LIMITED -THE- | Private company limited by shares | Live |
| Tung Kei Plumbing Limited | | Live |
| UNIVERSAL PLUMBING COMPANY, LIMITED | Private company limited by shares | Dissolved |
| UNIVERSAL PLUMBING COMPANY LIMITED | Private company limited by shares | Live |
| UNIVERSAL PLUMBING AND DRAINAGE WORKS LIMITED | Private company limited by shares | Dissolved |
| UWILL PLUMBING LIMITED | Private company limited by shares | Live |
| Victor Plumbing Company Limited | Private company limited by shares | Live |
| VINCENT PLUMBING ENGINEERING LIMITED | Private company limited by shares | Live |
| JIUMUWANG PLUMBING WARE CO., LIMITED | Private company limited by shares | Dissolved |
| WING FAT PLUMBING LIMITED | Private company limited by shares | Live |
| WING TAK PLUMBING COMPANY LIMITED | Private company limited by shares | Live |
| WING YIP PLUMBING AND DRAINAGE COMPANY LIMITED | Private company limited by shares | Live |
| Wing Go Plumbing Drainage Company Limited | Private company limited by shares | Live |
| LAW WING KEE PLUMBING & DRAINAGE WORK LIMITED | Private company limited by shares | Dissolved |
| HO KEE PLUMBING WORKS COMPANY LIMITED | Private company limited by shares | Live |
| MAN KEE PLUMBING & DRAINAGE WORKS LIMITED | Private company limited by shares | Dissolved |
| YUN FAT PLUMBING & DRAINAGE WORKS LIMITED | Private company limited by shares | Live |
| KOU KEE PLUMBING & DRAINAGE WORKS LIMITED | Private company limited by shares | Live |
| GOLDFULL PLUMBING WORKS LIMITED | Private company limited by shares | Dissolved |
| YEE HING KEE PLUMBING WORKS COMPANY, LIMITED | Private company limited by shares | Dissolved |
| WO HING PLUMBING & DRAINAGE WORKS COMPANY LIMITED | Private company limited by shares | Dissolved |
| LEON PLUMBING & GAS WORKS LIMITED | Private company limited by shares | Live |
| SUNWILL PLUMBING & DRAINAGE WORKS LIMITED | Private company limited by shares | Dissolved |
| PO YUNG PLUMBING LIMITED | Private company limited by shares | Dissolved |
| TAK KEE PLUMBINGS COMPANY LIMITED | Private company limited by shares | Live |