The tank-container's closing mechanism must have a pressure-release system which yields to an internal pressure of 300 kPa (3 bar) above normal pressure and in so doing frees an upward-facing opening with a pressure-release area of at least 135 cm2 (diameter 132 mm).
Chaque conteneur-citerne doit porter sur deux côtés opposés des étiquettes de danger conformes au modèle 3 du point 5.2.2.2.2 de l'annexe I, section I.1, de la directive 2008/68/CE.