A. All liquefied petroleum gases designated as commercial propane, commercial butane or mixtures thereof, sold for consumption in this state, shall, when subjected to the test methods of the GPA Midstream Association, meet applicable specifications adopted as tentative standards by the Association for the particular product sold.

B. All vehicles used in hauling or transporting liquefied petroleum gases upon the highways of this state shall be identified in such manner as the Administrator may, by rule, prescribe.

C. The Department of Public Safety of the State of Oklahoma shall cooperate with the Administrator in the enforcement of the provisions of this section, and the rules promulgated thereunder.

D. Transport trucks transporting liquefied petroleum gases intrastate which are owned or operated by a person subject to and licensed by the Oklahoma Liquefied Petroleum Gas Regulation Act shall not be required to obtain or possess an intrastate motor carrier or private carrier license issued by the Oklahoma Corporation Commission.

E. Containers shall be filled or used only upon authorization of the fee simple owner. The name of the fee simple owner, if other than the consumer, shall be conspicuously shown on the container.

F. At least one attendant shall remain close to the transfer connection from the time the connections are first made until they are finally disconnected, during the transfer of the product. During the actual transfer of liquids into containers at domestic type dwellings and installations, the attendant shall not enter into any type of enclosure including but not limited to truck cabs, dwellings and barns and shall maintain visual contact with the liquid level gauge at all times.