The 'High-Pressure Pump LHS 1 Plunger' for the Citroën DS up to 1966 is a vital component designed for hydropneumatic suspension. This pump circulates LHS (Liquide Hydraulique Synthétique) fluid under high pressure through the system, enabling the Citroën DS's unique ride height and damping. Featuring a single-plunger configuration, it enhances reliability, ensuring consistent performance. The part is tailored specifically for older models, contributing to the preservation of authentic driving experiences. Replacing or maintaining this pump is crucial for the functionality and safety of the suspension systems in vintage Citroën vehicles.