Pre-Filter – For use with cartridges only. Adds particulate protection.

• Must be used in conjunction with Pre-Filter Retainer.
• When attaching to 3M Half-Face or 3M Full-Face Reusable Respirators, a cartridge is also required.

Pre-Filter Retainer – Connects pre-filters to cartridges.

• Required adapter for N95 Pre-Filter
  and P95 Pre-Filter