The 40 FLDN 0400 to 1001 and 40 FLD 0120 to 0274 dual filters, for hydraulic systems, separate solids from fluids and oils. Installable in pipelines, they allow for uninterrupted filter changes. They stand out for their in-line installation, effective filter materials, high dirt retention capacity, optional maintenance indicator, modular design, and bypass valve. They operate at a pressure of 40 bar and a temperature of -10°C to +100°C, with top inlet and bottom outlet.