| 1 | Ace Valve |
| 2 | ALPEC Co.,Ltd. |
| 3 | API Basco |
| 4 | Benkan Korea |
| 5 | BHI Co., Ltd. |
| 6 | Bosung Powertec |
| 7 | CARTEC Sealing Technologies |
| 8 | CCI Valves |
| 9 | DAE SE STEEL CO., LTD. |
| 10 | Daebong Heavy |
| 11 | Daechang HRSG |
| 12 | DaeHung Co., Ltd |
| 13 | Daekyung Machinery & Engineering |
| 14 | Daekyung Technos |
| 15 | Dongbang Novoferm Inc. |
| 16 | Dongyang Pump |
| 17 | Dongyang Steel Pipes |
| 18 | Doosan Engineering & Construction Co. |
| 19 | Doosan Heavy Industries |
| 20 | EEW Korea |
| 21 | Hankuk Fiber |
| 22 | Hi Air Korea Co., Ltd. |
| 23 | Histeel |
| 24 | HLC Valve, Ho Chang Machinery |
| 25 | HSG Heavy Industries |
| 26 | Husteel Pipes |
| 27 | Hy-Lok Korea |
| 28 | Hyosung (HICO) |
| 29 | Hyosung Corporation |
| 30 | Hyosung, Kremenco |
| 31 | Hyundai Engineering and Steel Industries (HDESI) |
| 32 | Hyundai Heavy Industries (HHI) |
| 33 | Hyundai Pipe/Steel |
| 34 | Hyundai Valve |
| 35 | ILSUNG Corporation |
| 36 | ITT-Goulds Korea |
| 37 | J-Tech |
| 38 | Jeil Technos. Co., Ltd. |
| 39 | JeonJin Entech |
| 40 | Jinyang Specialty Steel |
| 41 | JNK Korea/J Tech |
| 42 | KangRim Heavy Industries Co., Ltd |
| 43 | KEOSAN PnF Co.,Ltd |
| 44 | Koch Glitch Korea |
| 45 | KOFCO |
| 46 | Kookjae valve (KJS) |
| 47 | Korea Cottrell-Jord |
| 48 | Korea Heat Exchangers (KHE) |
| 49 | Korea Heavy Industries(KHIC |
| 50 | KUMWOO co., Ltd |
| 51 | llshin Bellow Valves |
| 52 | LS Cable |
| 53 | LS Metal |
| 54 | MYSCO forging, PK Valve |
| 55 | NK CO., LTD |
| 56 | NSV corporation |
| 57 | POSCO |
| 58 | POSCO Plantec |
| 59 | Pyungsan Forging (PMC |
| 60 | S&S Valve |
| 61 | S&T Corporation |
| 62 | S&W Corporation |
| 63 | Sam-Jeong Steel Co., Ltd. |
| 64 | Samwhan Industry |
| 65 | Samyoung Heat Exchanger Co. LTD. |
| 66 | Seah Steel Pipes |
| 67 | SEONGHWA |
| 68 | Sewon Cellontech Co., Ltd. |
| 69 | Shinhan Steel |
| 70 | Sinwoo Metal co., Ltd. |
| 71 | Sung Hyun Perlite Co., Ltd. |
| 72 | Sung Kwang Bend Co. |
| 73 | Sungjin Geotec |
| 74 | TAE WOONG CO., LTD. |
| 75 | TAESANG Co., Ltd. |
| 76 | TK Corporation |
| 77 | Truflo Pump |
| 78 | TSM Tech |
| 79 | TY Valves |
| 80 | Wonil T & I Co., Ltd. |
| 81 | Wooyang HC |
| 82 | Y&S Co., Ltd. |
| 83 | Zeeco Inc. |