Tramec's Air Dryer Cartridges remove moisture and other contaminants from compressed air before it travels through system air tanks and valves. Featuring premium grade desiccant beads, easy-swap threaded mounting canisters, and oil-filtering multi-stage media, Tramec Oil-Coalescing AD-IP Style Air Dryer Cartridges prevent freeze-ups while extending component life span throughout your air brake system.