NATO Issue Gas Mask 40mm Filters - Fits Swiss, US, Israeli Gas Masks - SWISS MADE & NBC Rated
Brand new, current issue! Great collectible! And extra useable Filters for your Swiss Gas Mask. Certified Swiss nuclear, biological, chemical. Condition: brand new, never issued. NATO 40mm threaded. Fits Swiss, US, Israeli and other NATO 40mm canister threaded filters. Sealed in plastic air-tight pod which must be cut open. This case can not be resealed.The filter will last for 30 days after the seal has been broken. There is no expiration date before that. You can keep it stored for years, as long as the seal is not broken. The expected shelf life of a filter that is exposed to air is usually about 30 days after opening the seal. To extend theprotective life (properties) of the filter, it is recommended that it be packaged in a plastic zip-loc freezer bagwhen not in use.To extract the filter from its protective plastic casing, it needs to be cut out with a utility knife. Thefirst step is to determine which side to cut to prevent damage to the filter's shell. Press firmlyalong the outer edges of the flat surface.  If the plastic surface is hard and does not flex, this is therespirator port side. Turn the filter over and press on the outer edges of this flat surface. This side shouldflex when pressed down with your thumb. This side is the threaded stem portion of the filter. You needto cut the plastic casing from this side to prevent damage to the outer shell of the filter. Slowing insert autility knife into the outer edge and start to cut the plastic in a circular pattern. Once enough of the plasticsurface is opened,  you can safely remove the filter from its protective plastic casing. The filter is now readyfor use.MANUFACTURED EXCLUSIVELY FOR ARMYUNIVERSE.