Each boiler subject to the provisions of section 29-232-69 shall, upon completion of the installation, be inspected by a duly authorized inspector before operation. At the time of this inspection, each boiler shall be stamped with a serial number of the state of Connecticut preceded by the letters CONN, said letters and figures to be not less than five-sixteenths of an inch in height. The stamping shall not be concealed by lagging or paint and shall be exposed at all times.
Conn. Agencies Regs. § 29-232-70