2091 P100 Replacement Particulate Filters Respirator for 6000 6200 6800 7000 FF-4. Compatible With FF-400 And ALL 6000 & 7000 Series Respirator Masks IE: The 6200, 6300, 7502, 7503, etc. 2091 Particulate Filter Set (10-216 PCs). Factory Sealed, In Retail Packaging. Compatible With ALL 6000 & 7000 Series Respirators 6200, 6300, 7502, 7503 etc. Compatible With The FF-400 Respirators.