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Specification: 💎Material: High quality silicone, 💎Dual Cartridge 💎P-A-1 LDY#3 Filter Cartridge 💎CONNECTION: general screw interface LDY#3 Filter Offers Protection against: Dust, gasoline, carbon dioxide, ether, nitroalkane, nitrobenzene, carbon trichloride, nitrobenzene, gases & organic vapor, chlorine benzene, acetone, alcohols, anilines, carbon dioxide, carbon tetrachloride, chloroform, chloropicrin, and many other pollutants. Please contact us if you want more info about how long to replace filter in your environment, we will provide our advises.