We recommend at least 2 spares per mask.
These fit Israeli Youth, Adult, and M-15 masks, or any standard 40mm threaded gas mask. Please be aware that there is no guarantee of age or validity on these filters. These are sealed, NEW, uncirculated surplus stock, but don’t come with the guarantees of a Scott or MSA 2002/3 made new filters. Individual lots may vary in shape or shading, but all are 40mm NBC filters