This KLXK32551X air filter uses thick multi-layer composite filter paper with dense uniform deep pleats, greatly expanding effective dust capture surface area to hold massive fine sand, ash and pollen without rapid clogging. The surface waterproof coating avoids paper softening and breakdown under rainy or humid transportation environments. Surrounded by integrated high-elastic red rubber sealing frame, it fits tightly against the inner wall of Dongfeng Captain air filter housing without gaps, completely stopping unfiltered dust bypass that scratches engine cylinders. The rectangular outline strictly follows original vehicle housing internal size, direct plug-and-play replacement without trimming filter edges or adding auxiliary gaskets. Smooth inner airflow channel controls intake resistance reasonably, ensuring sufficient oxygen supply for engine combustion to avoid power drop and excessive fuel consumption during heavy load haulage.
