(13)It is necessary to ensure that products covered by this Directive entering the Union market from third countries comply with all applicable Union requirements, and in particular that appropriate assessment procedures have been carried out by manufacturers with regard to those products. Provision should therefore be made for importers to make sure that the products they place on the market comply with the applicable requirements and that they do not place on the market products which do not comply with such requirements or which present a risk. For the same reason, provision should also be made for importers to make sure that conformity assessment procedures have been carried out and that the CE marking and documentation drawn up by manufacturers are available for inspection by the supervisory authorities.