Ordering Description Product number Description: Victor Professional Flow Meter SR 311, High Capacity, 100 SCFH, Carbon Dioxide, 320, 5/8-18 (F) CGA 032 Product number: 0781-0353 Description: Victor Professional Flow Meter SR 312, High Capacity, 100 SCFH, Carbon Dioxide, 320, 5/8-18 (F) CGA 032 Product number: 0781-0354 Description: Victor Professional Flow Gauge SR 310, High Capacity, 200 SCFH, Carbon Dioxide, 320, 5/8-18 (F) CGA 032 Product number: 0781-0355