22HA Oxygen regulator (welding flowmeter, welding accessory)... 22HA Oxygen regulator (welding flowmeter, welding accessory)1. Designed for MIG and TIG ... gth4. Calibrated for argon, helium and carbon dioxide gases5. Flowmeter is backpressure compensated to ensure accurate readings when linerestrictions are ... 8. Sintered bronze inlet filter Oxygen regulator (welding flowmeter, welding accessory)