1.013.9002 / 1.013.9109 are fuel filter elements for Kaishan drilling rigs, installed in the engine fuel supply line between the fuel tank/coarse filter and the high-pressure injection pump. Their specific purpose is to remove fine particulate contaminants and residual water from the diesel before it enters the injection pump and injectors, protecting these precision components from abrasive wear, seizure, and corrosion.
