3M™ Filter Holder 7586 for 3M™ Half Mask 7500 Series - spare part to allow for maintenance. Fits all sizes of 3M™ Half Mask 7500 Series Specially designed for use with 3M™ Reusable Half Mask 7500 Series Includes two inhalation valves and one exhalation valve in each pack Quick and easy to fit Increases the effective service life of your equipment