Ariz. Admin. Code § R11-1-516
A quick-close type air valve shall be provided on each piece of pneumatic-powered loading, hauling, and dumping equipment. The valve shall be closed except when the equipment is being operated.
Former Rule 5:16; Former Section R11-1-516 repealed, new Section R11-1-516 adopted effective August 18, 1980 (Supp. 80-4).