If the filters are rated NBC and not expired you should be good to go.
Are there any 40mm NEW NBC filters left?
If the filters are rated NBC and not expired you should be good to go.
Are there any 40mm NEW NBC filters left?
What type of 40mm filter do the Canadian C3 Gas Masks come with? On your site it says, "not Canadian surplus" for the filters.
any 40mm will fit in.