The Bendix® AD-IP® (Integral Purge) air dryer-and the Bendix® AD-IP® air dryer with PuraGuard® oil coalescing collect and remove air system contaminants in solid, liquid, and aerosol form, before they enter the brake system. They provide clean, dry air to the components of the brake system which increases the life of the system and reduces maintenance costs. Daily manual draining of the reservoirs is eliminated.