Details New dual flow cartridges and filters allow for easier breathing Quick, simple cartridge connection. Simply align the connections and push until you hear a click Use with 3M™ Secure Click™ Reusable Respirators HF-800SD Series Swept-back design allows an enhanced field of view and compatibility with welding and grinding shields 3M™ Secure Click™ Cartridge A1 D8051 is CE approved against certain organic vapours with a boiling point above 65 °C. Use our cartridge with 3M™ Secure Click™ Half Facepiece Reusable Respirator HF-800SD Series. New dual flow cartridges and filters allow for easier breathing. 3M™ Secure Click™ Gas and Vapour Filter A1 D8051 protects against organic gases and vapours with a boiling point above 65 °C. Suitable for use with 3M™ Secure Click™ Reusable Respirators HF800SD Series, our cartridges can also be used in combination with 3M™ Secure-Click™ Particulate Filters D7900 Series, with a 3M™ D701 Filter Retainer.