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● 3M 501 pre-filter adapter allows you to attach gas filters to particulate filters to increase the usability of your mask.
● Specially designed for 3M half and full masks with bayonet filter connection.
● Fits 3M 5000 series particulate filters and 3M 6000 series gas and vapor filters.
● Increases the possibilities of using the masks.
● Quick and easy installation.
● Fits in pack 2 units.
