Air Dryer Cartridges are commonly used in air-over-hydraulic braking systems to remove moisture and maintain braking power. When the desiccant in the cartridge eventually loses its ability to absorb moisture, the cartridge should be replaced. Cat® Air Dryers provide the highest quality product because each cartridge is thoroughly tested against stringent Caterpillar specifications. With a full 12-month warranty, and off-the-shelf availability that minimizes your down time, Cat Air Dryers are a smart investment.Cat diesel engine parts are manufactured to precise specifications and are built for durability, reliability, productivity, less environmental impact, and reuse.Our off-the-shelf availability minimizes downtime and gets you up and running fast.You can have peace of mind with a full 12-month warranty on our Cat diesel engine parts.You're buying less downtime and lower repair bills, helping you achieve the lowest owning and operating costs over your engine’s lifecycle.