Keeping you Ready for the Road Ahead , the Dorman Remanufactured Selective Catalytic Reduction Supply Module Pump delivers peak performance for the Selective Catalytic Reduction (SCR) system. Diesel exhaust fluid is used to reduce NOx emissions. This process can be both insidious and destructive. When it evaporates, white crystal deposits are left in the supply module that can cause the pump seals and the pump itself to fail. Polluted DEF can also negotiate performance of the pump due to the supply module’s usual exposure to vibration, dirt, and extreme temperatures. Such compromise can lead to engine failure. Dorman’s remanufacturing process ensures a premium replacement for a reliable repair. Dorman has a distinguished reputation in the heavy duty truck and trailer aftermarket, manufacturing a variety of parts for a complete repair. Through advanced engineering, Dorman successfully checks into today’s most common failures to figure out the why, ultimately delivering modern solutions that not only match OEM parts, but solve known issues. FleetPride is your First Click in Heavy Duty .