CPV code 42921100 designates Machinery for cleaning or drying bottles or other containers in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
42921100 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 42921000 (Machinery for cleaning, filling, packing or wrapping bottles or other containers).