Review on 3M 603 Respiratory Protection Component by Brian Page

They fit nicely in my respirator (7500 series). They hold a P95 particulate filter perfectly BUT they require a 501 holder which you may miss if you don't read carefully. I'm all for buying individual pieces because you don't always need a full set, but I think it's idiotic NOT to offer a full set to new buyers. Or for those who are replacing a set and don't want to keep track of multiple sellers/items, which often have large price/availability differences for each item, which ends up costing a lot more than a full set. for a purchase. I don't know who is to blame for the lack of a proper set, but this is seriously frustrating.