Equip your semi with clean and dry pneumatic systems to optimize air brake performance, with the OTR AD-IS/SP Style Air Dryer Cartridge with Expertise Built In™. Due to its tight-filtering design, this replacement filter is able to remove dust, oil, dirt, and other contaminants from the air lines to defend against corrosion, ice formation, and potential valve damage. Constructed with sturdy materials to endure demanding operating conditions such as high temperatures and rough vibrations. FleetPride is your First Click in Heavy Duty®.