Amazon.com: MIRA Safety - NBC-77 SOF - Single 40mm Gas Mask Filter - Special Combined CBRN Respirator Filters - NATO Standard Size (40mm x 1/7") - Canister Filter Fits CBRN Gas Masks -
3M™ 6038 (P3 + ozone) Particulate Filter
Buy P3R particle filter for breathing prot. series 175 online