CPV code 34996200 designates Control, safety or signalling equipment for inland waterways in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
34996200 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 34996000 (Control, safety or signalling equipment for roads).