Victor® FM 371 Medium Capacity Three Gas Calibration Flow meter offers 5 - 40 SCFH, 5 - 50 SCFH, 20 - 150 SCFH flow range for carbon dioxide, argon and helium respectively. Flow meter with 25 psig inlet pressure features 5/8" RH (M) inlet fitting and 5/8"-18 RH(F) outlet fitting. It is ideal for MIG/TIG welding and cover tube of the flow meter consist of overpressure protection. Flow tube and outer tube of the flow meter are made of impact resistant lexan.