This is a hydraulic suction filter element, serving as the first pre-filtration barrier for hydraulic systems. Installed at the hydraulic pump suction port/pipeline, it uses folded glass fiber media and buckle-type plastic end caps to achieve low pressure drop and high dirt-holding capacity under negative pressure. It efficiently filters large particles ≥25μm to protect hydraulic pumps from wear, can replace Hydac, Pall and other brands 1:1, and is widely used in construction machinery, industrial hydraulic stations, wind power and other scenarios.