The EGR valve reduces nitrogen oxide emissions by recirculating a portion of exhaust gases back into the engine intake manifold. EGV575 EGR Valve For For Mazda For Mercury For Explorer For Exhaust Gas Recirculation. Reduced exhaust pollutants: Introducing some exhaust gas into the intake manifold and back into the cylinder lowers combustion temperature, reducing nitrogen oxide emissions and meeting environmental standards. It maintains reliable operation even in extreme engine environments and protects the engine from damage caused by abnormal pressure. Exhaust gas dilutes the air-fuel mixture, reducing combustion intensity, resulting in smoother operation., Manufacturer: zeshibai