For Particulate/Gas/Vapor combination, the filter pad retainer is used to hold the filter pad in place on top of the air purifying cartridge.  The retainer particulate filter pad holder base is used for Gerson masks SKU Numbers: 76-9100, 76-9200, 76-9300, 76-8990 and 76-8995.

20 per Box

SKU#  76-0172