CPV code 44621111 designates Non-electrically-heated central-heating radiators in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
44621111 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 44621110 (Central-heating radiators).