Update your semi with a clean and contaminant-free fuel line, with the Donaldson P550851 Fuel / Water Separator Filter Cartridge that ensures you're Ready for the Road Ahead™. To protect the fuel injection system, this replacement cartridge collects harmful contaminants before the fuel is combusted in the engine. Engineered with robust materials to withstand demanding conditions and extend the interval time between each component change. The air conditioning and heating system in heavy duty trucks has a major impact on drivers’ safety and comfort level. Whether you are looking for A/C compressors, condensers, driers, freon, or blower motors, FleetPride has the part you need to make sure your air conditioning and heating are well maintained. Keep your heavy duty fleet operations working as productively and efficiently as possible by finding the right air conditioning and heating part for you. FleetPride is your First Click in Heavy Duty®.