Details Attaches 3M™ Particulate Filters 2000 Series and 3M™ Gas and Vapour Filters 6000 Series Increases the scope of potential applications Specially designed for 3M half and full-face masks with bayonet-style filter attachments Quick and easy to fit 3M™ Filter Adapter 502 attaches gas filters to particulate filters and increases the scope of potential applications. Our filter adapter is specially designed for 3M half and full-face masks with bayonet-style filter attachments The 3M™ Cartridge/Filter Adapter 701 is to used with compatible products. Replacement part can extend respiratory equipment service life.