Medical Oxygen Regulator(CE,FDA) Materials of ConstructionBrass: Inlet Retainer, Relief Valve, Piston, ... /8” NPT, Fill/RefillExterior Markings: Model No., Description, “Made in CHINA” text and “Use No Oil” textPackaging and Labeling: Box to ... .0” x 3.0”, Box Label Matching Current Medical Oxygen Regulator(CE,FDA)