The MSA Mersorb P100 Advantage® Respirator Cartridge is compatible with Advantage® series air purifying respirator is designed to give protection against chlorine and mercury vapors. When used with a P100 prefilter it offers extra protection against all particulates. Provide lightweight, low-profile performance. Cartridges fit Advantage® 200 LS and 420 half-masks, and 1000, 3000, and 4000 series full-facepiece respirators. This respirator cartridge is rendered with a bayonet-style design for quick mounting which locks into place with one twist.