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The Military Surplus Gas Mask Filter is a standard military surplus gas mask filter. These gas mask filters are designed to work with any gas masks that use 40mm filters, which includes virtually all military surplus gas masks including the Israeli gas masks. While these gas mask filters are surplus and we cannot guarantee the level of protection, they can be used for training purposes to better understand how your gas mask works. No longer will you need to use your expensive brand new filter to test your mask, you can use these military surplus filters for all training exercises.