3M™ Filter Adapter, Respiratory Protection System Component, 502 (Box of 10 packs)The 3M Filter Retainer 502 is required to hold the 3M Particulate Filters 2000 Series and 6035 6038 filters, to the 3M Cartridges 6000 Series. For more information, contact 3M TechAssist Helpline Australia 1800 024 464 New Zealand 0800 364 357. Use to attach 3M Particulate Filters 2000 Series and 6035 6038 filters, to the 3M Cartridges 6000 Series for a wide variety of applications Particle filter adapters increases scope of potential applications