Product Details: The Haldex AD-IS Air Dryer is the perfect solution for your air brake system. This desiccant-type in-line filtration system effectively removes even the smallest oil particles, ensuring your air brake system is running at peak performance. The automatic drain valve is controlled by the governor, allowing for easy maintenance and operation. The unit is also rebuilt to withstand even the harshest operating conditions, making it a cost-effective air brake dryer option that works just as good as the brand-new unit. With its 1/2" NPT supply and 1/4" NPT delivery, it is the perfect choice for your air brake system. FleetPride is your First Click in Heavy Duty®.