This Genuine Victor Heavy Duty, Size 350 Regulators are durable and made to resist an intensive workload. Manufactured in Thick Heavy Brass, No plastics, No painted thin metal sheets. 2-1/2" Easy to read Big Gauges - Oxygen Delivery Pressure: 5-125 psi. - Acetylene Delivery Pressure: 2-15 psi Oxygen Tank Connector: CGA-540 Fits all American Oxygen Cylinders. - Acetylene Tank Connector: CGA-510 Fits all Acetylene and Propane Cylinders EXCEPT Sizes MC and B Acetylene Cylinders, ***PLEASE carefully check the picture with the incompatible tanks, This acetylene regulator WILL NOT FIT size MC and B acetylene tanks*** Delivery hose connectors, Oxygen: 9/16" - 18 (RH Male) and Actylene/Propane: 9/16" - 18 (LH Male)