All gas safety cocks, valves or appliances, as provided in this subchapter, shall be of a design, quality or workmanship as to be reasonably certain to perform the work required to be done thereby. These safety cocks, valves or appliances shall be approved by and installed under and continue to remain under the supervision and control of the Chief of the Fire Department of the city.
(Prior Code, § 50.31) Penalty, see § 10.99