The RWS Series Flowmeters provide accurate measurement of gas flow in welding and laboratory applications. All models are designed for an inlet pressure of 50 PSIG and are furnished with a 1/8 NPT female inlet. Industrial Flowmeters and Regulators, RWS Series Industrial Station Drop Flowmeters, Western , Western RWS-2-13,IND.AR/CO2 FM 10-70 SCFH.