3M™ Secure Click™ Particulate Prefilters are used to add particulate protection to 3M™ Secure Click™ Dual-flow Gas & Vapor cartridges. Replaceable for cost savings: these particulate filters are designed to be easily replaced for a cost-effective solution without changing out your cartridges. 3M™ Secure Click™ Particulate Prefilters are only compatible with 3M™ Secure Click™ Gas/Vapor Cartridge D8000 Series to add particulate protection. Used in pairs, attach one filter to each side of 3M™ Secure Click™ Dual-Flow Gas and Vapor cartridges using a 3M™ Secure Click™ D701 Filter Retainer to help protect against certain particulates including dusts, mists, fibers, and metal fumes in addition to a broad range of gases and vapors. Help protect your workforce: 3M offers a free online tool to help you select the appropriate respirators, cartridges, and filters for your workplace respiratory haza