The Haldex General Service Kit for Pure Air Plus is the perfect solution for minimizing waste and promoting a more environmentally friendly approach to air purification. This kit includes a desiccant cartridge, coalescing filter, relief valve, purge shield, associated hardware, and instructions to help you get the job done quickly and efficiently. The desiccant cartridge helps to remove dust and allergens from the air. The coalescing filter helps to trap and remove particles from the air. The relief valve helps to regulate the pressure of the air. The purge shield helps to protect the filter from damage. FleetPride is your First Click in Heavy Duty .