Conn. Gen. Stat. § 43-31: Sale of preheated petroleum products to be by weight.

The quantity of all preheated petroleum products sold, offered for sale or delivered at retail shall be determined by weight, such weighing to be done by a public weighmaster licensed by the state of Connecticut, who shall weigh such products in the containers or vehicles in which they are to be delivered and on scales that have been tested and sealed by an authorized sealer or inspector of weights and measures.