A manual master quick-close type air valve shall be installed on all pneumatic-powered equipment if there is a hazard of uncontrolled movement when the air supply is activated. The valve shall be closed except when the equipment is being operated.
053-3 Wyo. Code R. § 57.14114
53 FR 32528, 8/25/1988; 53 FR 44588, 11/4/1988