CPV code 51514110 designates Installation services of machinery and apparatus for filtering or purifying water in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
51514110 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 51514100 (Installation services of liquid filtering or purifying machinery and apparatus).