3M-5N11 Filter Retainer 501

NIOSH approved for environments containing certain non-oil-based particles.
Use on top of 3M gas and vapor cartridges with 3M 501 Retainer when particles are also present.
Use on top of 3M 603 Filter Holder and 3M 501 Retainer to reduce particulate exposure.
Replaceable particle filter for cost savings.