CPV code 42997100 designates Machines for inspecting the internal surface of pipelines in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
42997100 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 42997000 (Pipeline machinery).