3M™ 051138-21571 5201 5000 Disposable Half Facepiece Respirator Assembly, M, Resists: Acid Gas, Chlorine, Hydrogen Chloride, Hydrogen Fluoride, Hydrogen Sulfide, Organic Vapors and Sulfur Dioxide 3M™ 051138-21571 5201 5000 Disposable Half Facepiece Respirator Assembly, M, Resists: Acid Gas, Chlorine, Hydrogen Chloride, Hydrogen Fluoride, Hydrogen Sulfide, Organic Vapors and Sulfur Dioxide