(a) Each tank car and each tank truck carrying inspected and passed product from an official establishment shall bear a label containing the name of the product in accordance with section 317.2 of this Article, the official inspection legend containing the number of the official establishment and the words “date of loading”, followed by a suitable space in which the inspector shall insert the date when the tank car or truck is loaded. The label shall be located conspicuously and shall be printed on material of such character and so affixed as to preclude detachment or effacement upon exposure to the weather. Before the car or truck is removed from the place where it is unloaded, the carrier shall remove or obliterate such label.

(b) Tank cars and tank trucks carrying inspected and passed product from an official establishment to another official establishment shall be equipped for sealing and securely sealed by a department employee with an official seal of the department bearing the official inspection legend as prescribed in Part 312 of this Article.