Cartridge, NIOSH Rating Chlorine (CL), Hydrogen Chloride (HC), Hydrogen Fluoride (HF), Organic Vapor (OV), Sulfur Dioxide (SD), Yellow, Compatible with Brand and Series Sundstrom SR 510, Respirator Cartridge Type Air Purifying Respirator, Respirator Connection Type Push to Connect, Package Quantity 4. This item has been restricted from sale in the following state (s): []