Ordering Description Product number Description: EDGE Series, ESL42-80-250 Line Regulator (Air, Oxygen, Inert, CO2, N2O) Product number: 0781-5282 Description: EDGE Series, ESL42-15-250AR Line Regulator (Acetylene) Product number: 0781-5279 Description: EDGE Series, ESL42-80-250F Line Regulator (Hydrogen, Methane, Natural Gas, LP Gas) Product number: 0781-5296 Description: EDGE Series, ESL42-15-250A Line Regulator (Acetylene) Product number: 0781-5294 Description: EDGE Series, ESL42-200-250F Line Regulator (Hydrogen, Methane, Natural Gas, LP Gas) Product number: 0781-5297 Description: EDGE Series, ESL42-80-250XR Line Regulator (Oxygen) Product number: 0781-5280 Description: EDGE Series, ESL42-200-250X Line Regulator (Oxygen) Product number: 0781-5300