MST®’s Respiratory Protector® Series Breathing Air “Purification” Systems remove water, oil, dirt, rust, scale, gaseous hydrocarbons and deadly carbon Monoxide gas from compressed air lines to provide the Maximum in Breathing Safety.  Most “Filtration” Systems stop at the removal of taste and odors – MST’s Respiratory Protector® Series adds that Fourth Stage of “purification” safely to help remove deadly Toxic Gases, including Carbon Monoxide, providing the Ultimate in Breathing Safety!  Why just “filter”, when you can “Purify”?