Innovative hydraulic shock absorber made of aluminum and stainless steel, quiet and long-lasting for stable and safe mooring. Quality of life on board is improved by progressive damping action, which reduces boat sway and prevents annoying squeaking. The hydraulic fluid is 100% biodegradable. Its internal components are impervious to the corrosive action of the sea: in fact, the robust structure surrounding them protects them from any external corrosive agent. It guarantees consistent mechanical characteristics over time, minimal maintenance, and a lifetime many years longer than current systems.