If you want to combine your N95 and R95 filters with any gas or vapor cartridge, the 8020 filter retainer by Moldex is the right choice. It is a perfect replacement which installs in seconds. The 8000 series half mask respirators like other respirators use filters to work in polluted and contaminated environments. This filter retainer allows you to combine our already purchased N95 and R95 filters with any cartridge. The 8020 filter retainer is 100% PVC (free poly vinyl chloride) and is environment friendly. This pre-filter retainer is intended for use with 8000 series cartridges. Additionally, this is a perfect choice to be used with half mask respirators.