MSHA - Code of Federal Regulations - 30 CFR 56.14114
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MSHA - Title 30 CFR
30 CFR § 56.14114
Air valves for pneumatic equipment.

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.