| Member Name | Founded Year |
| PFERD Inc. | 1799 |
| Roengten USA | 1899 |
| ESAB Welding & Cutting | 1904 |
| Federated Insurance | 1904 |
| Hartman Brothers, Inc | 1904 |
| City Carbonic LLC | 1909 |
| The Harris Products Group | 1914 |
| Arcos Industries, LLC | 1919 |
| Earlbeck Gases & Technologies | 1919 |
| Keen Compressed Gas Company | 1919 |
| DeLille Oxygen Company | 1924 |
| JAZ Brush USA | 1924 |
| Rexarc International Inc. | 1924 |
| Rocky Mountain Air Solutions | 1924 |
| | |
| Koehler Welding Supply | 1929 |
| Maine Oxy-Acetylene Supply Company | 1929 |
| Dale Oxygen, Inc. | 1939 |
| Huber Supply Company, Inc. | 1939 |
| Mississippi Welders Supply Company, Inc. | 1939 |
| A-OX Welding Supply Company. Inc. | 1944 |
| Atlas Welding Supply Co., Inc. | 1944 |
| Hiab USA Inc | 1944 |
| Wagner Welding Supply | 1944 |
| Weiler Abrasives Group | 1944 |
| American Welding & Gas, Inc. | 1949 |
| Barnes Welding Supply (Division of Fresno Oxygen & Welding Suppliers, Inc.) | 1949 |
| Middlesex Gases & Technologies, Inc. | 1949 |
| Strate Welding Supply Company, Inc. | 1949 |
| Uniweld Products, Inc. | 1949 |
| Atlas-Lenco | 1954 |
| DuPuy Oxygen & Supply Company | 1954 |
| Humphries Incorporated | 1954 |
| K C Welding Supply Inc. | 1954 |
| T. J. Nowak Supply Company Inc. | 1954 |
| Thunderbird Cylinders | 1959 |
| ORS Nasco-an Essendant Company | 1959 |
| Oxygen Service Company | 1959 |
| Wayne Oxygen & Welding Supply | 1959 |
| Dennis Welding Supply | 1964 |
| Diversified CPC International | 1964 |
| John’s Sales & Service Inc. | 1964 |
| Leonard’s | 1964 |
| Nova Gas Technologies | 1964 |
| ACME Cryogenics, Inc. | 1969 |
| Dynabrade, Inc. | 1969 |
| General Air Service and Supply Company | 1969 |
| Genstar Technologies Company, Inc. (Gentec) | 1969 |
| Lake Welding Supplies, Inc. | 1969 |
| New Bedford Welding Supply, Inc. | 1969 |
| Veite Cryogenic Equipment and Service, Inc. | 1969 |
| Vern Lewis Welding Supply, Inc. | 1969 |
| Analgesic Services Inc | 1974 |
| Black Stallion (Revco Industries, Inc.) | 1974 |
| County Welding Equipment | 1974 |
| Oxylance | 1974 |
| Sentry Welding Supply | 1974 |
| | |
| B & R Industrial Supply, Inc. | 1979 |
| Buckeye Welding Supply | 1979 |
| Four Corners Welding & Gas Supply | 1979 |
| TRENDEX INC. | 1984 |
| | |
| Airco Gases | 1989 |
| Direct Wire and Cable, Inc. | 1989 |
| Three Mules Welding Supply | 1989 |
| Discount Helium of Dallas | 1994 |
| Independent Welding Supply, LLC | 1994 |
| IWDC | 1994 |
| AIWD | 1999 |
| Church Towne Gas & Welding Supply | 1999 |
| LISAM | 1999 |
| Northeast Pressure Vessel Testing | 1999 |
| Ratermann Cryogenics | 1999 |
| Sky Cylinder Testing, Inc. | 1999 |
| Advanced Specialty Gases | 2004 |
| Airtec Gases | 2004 |
| CIMC ENRIC | 2004 |
| TS Italia SRL | 2004 |
| Weldsale Company | 2004 |
| Alliance Distribution | 2009 |
| Alloy Custom Products Inc. | 2009 |
| Cerity Partners | 2009 |
| Cryoworks, Inc. | 2009 |
| Global Calibration Gases | 2009 |
| Nozzle Clean | 2009 |
| DDS | 2014 |
| Gulf Gases & Technology | 2014 |
| Virtair | 2014 |
| Anova | 2019 |
| Finnco | 2019 |
| Industrial Gas Consultants | 2019 |
| Premier Cryogenic Services | 2019 |
| Select Gases | 2019 |
