#N75SC North Defender™ Multi-Purpose Cartridge from North by Honeywell. Fits North® 7700 Series Half Mask and 7600 Series Full Facepiece Silicone Respirators. Organic Vapor, Ammonia (escape), Methylamine, Formaldehyde, and Acid Gas: Chlorine, Hydrogen Chloride, Sulfur Dioxide, Hydrogen Sulfide [escape], Hydrogen Fluoride, Chlorine Dioxide). Package of 2.