Product Details: The Haldex AD-9 Air Dryer is a desiccant-type in-line filtration system that effectively removes even the smallest oil particles from your air system. This air dryer is designed to be rebuilt to withstand even the harshest operating conditions. It features a 1/2" NPT delivery and a 1/4" NPT control port. The automatic drain valve is controlled by the governor and the unit comes with the necessary wiring harness and mounting bracket. This air dryer is the perfect solution for keeping your air system clean and efficient. FleetPride is your First Click in Heavy Duty®.