The ZPure™ M PolyGas II Purifier is a 3.8 Liter (3800cc) 316SS canister that removes H2O, CO2, halogenated compounds, siloxanes, hydrocarbons heavier than butane, sulfur-containing molecules, ammonia and other gases It can be used to purify inert gases, He, Ar, N2, and H2, and clean dry air (CDA), to low-ppb levels It is recommended for any application requiring ultra-pure gas free from water and hydrocarbons