3M 701 Black/Orange Filter Adapter - 051138-29113 [PRICE is per BAG of 2]: Safety Respirator Cartridges And Filters: Amazon.com: Tools & Home Improvement
3M™ High Flow Series Filter Cartridge HF40-S, 5613305, 0.2 um NOM, 2.5 gpm, 25000 gal, 2/Case | 3M United States