The Baldwin Diesel Exhaust Fluid Strainer for Mack / Volvo is designed to remove contaminants from DEF to ensure the proper function of the vehicle's selective catalytic reduction system. This DEF filter prevents plugged dosing valves and enables the SCR system to reduce harmful oxides of nitrogen (NOx) emissions from diesel engines. This strainer is constructed with high-quality materials for long-lasting performance and reliability. FleetPride is your First Click in Heavy Duty®.