Ala. Code § 11-50-403
No rules or regulations promulgated by a gas district pursuant to the authority conferred by this article shall supersede any valid rules, regulations, or codes promulgated by a municipality situated in the territory served by such gas district with respect to the installation, connection, maintenance, and servicing of gas fixtures, pipes, appliances, and equipment within the corporate limits of such municipality or its police jurisdiction.
In the event of any conflict between any rules or regulations promulgated by a gas district pursuant to this article and those adopted by a municipality situated in the territory served by such gas district, those adopted by such municipality shall apply and shall be controlling with respect to the installation, connection, maintenance, and servicing of gas fixtures, pipes, appliances, and equipment within the corporate limits of such municipality and its police jurisdiction.
Ala. Code § 11-50-403 (1975)