Gas Mask – Chemical Biological Radiation Size 4. Issued to a law enforcement officer for use with tear gas situations. The item “Gas Mask CBR Civilian CD V-805 / size 4″ is in sale since Friday, March 13, 2020. This item is in the category “Business & Industrial\Facility Maintenance & Safety\Personal Protective Equipment (PPE)\Masks & Respirators\Mask Replacement Cartridges”. The seller is “atxst40″ and is located in Austin, Texas. This item can be shipped to United States.