Shut-off valves shall be installed, after the effective date of this Act, every 1,000 feet in all air lines and, in all branch air lines at a point near the main air lines.
225 ILCS 705/15.04
Shut-off valves shall be installed, after the effective date of this Act, every 1,000 feet in all air lines and, in all branch air lines at a point near the main air lines.
225 ILCS 705/15.04