Category G Fittings
| Buckling Pin Valves | Bs & B Safety Systems Inc. |
| Low Pressure Rupture Disks up to 12″ dia | Zook Canada Inc. |
| PR Valves Up to 1″ dia up to 350 PSI | Conrader Valves |
| Pressure and Temperature Relief Valves up to 2″ dia | Cash Acme / Reliance Worldwide |
| Rupture Disks up to 1.25″ dia | Fike Corporation |
| Rupture Disks up to 28″ dia | Elfab Ltd. |
| Safety Valves Various Types | ROSS Controls |
| Safety Relief Valves | Aquatrol Inc. |
| Safety Relief Valves | Ari Armaturen Albert Richter Gmbh & Co. Kg |
| Safety Relief Valves | Nouva General Instruments |
| Safety Relief Valves | Seetru Limited |
| Safety Relief Valves | Taylor Valve Technology |
| Safety Relief Valves up to 1″ dia | F. C. Kingston Company |
| Safety Relief Valves up to 1″ dia | R. Conrader Company |
| Safety Relief Valves up to 1.5″ dia | Parker Hannifin Corp., Refrigerating Specialties D |
| Safety Relief Valves up to 3″ dia | Cyrus Shank |
| Safety Relief Valves up to 3″ dia | Farris Engineering, Div. Of Curtiss-Wright Flow Co |
| Safety Relief Valves up to 3″ dia | Hydroseal Valve Company |
| Safety Relief Valves up to 3/4″ dia | Flow Safe Inc. |
| Safety Relief Valves up to 3/8″ dia | Hui Bao Enterprise Co., Ltd. |
| Safety Relief Valves up to 6″ dia | Conbraco Industries Inc. |
| Safety Relief Valves up to 6″ dia | Leser Gmbh & Co. Kg. |
| Safety Relief Valves up to 8″ dia | Mercer Valve Company Inc. |