3M Secure Click Combination Filter D8055, A2, for protection against organic gases and vapors (boiling point above 65 ºC). The 3M Secure Click Combination Filter D8055, A2, is a lightweight filter that combines protection and comfort. It offers low breathing resistance and a good balance with optimal visibility. The combination filter can be quickly and easily clicked into place on the 3M Secure Click HF 800(SD) half mask series. To connect with the D7000 series particle pre-filters, you will also need the D701 filter cover.