CPV code 50222100 designates Repair and maintenance services of dampers in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
50222100 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 50222000 (Repair and maintenance services of rolling stock).