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The standard-issue filter that is issued with the S-10 Gas Mask also known as an OEM (Original Equipment Manufacturer) filter, it is a 40mm thread fitting.
Below is information provided from Avon (the manufacturer of the S-10 and its filters)
The filters were designated as CBRN level of protection for use in Military or Law enforcement.
Note on the Image with the filter with the red tape around it, indicates that the filter has been De-commissioned and not to be used for a live situation, instead for training purposes. - These are the most commonly found on sites such as eBay