MSHA - Code of Federal Regulations - 30 CFR 56.4202
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MSHA - Title 30 CFR
30 CFR § 56.4202
Fire hydrants.

If fire hydrants are part of the mine's firefighting system, the hydrants shall be provided with

(a) Uniform fittings or readily available adapters for onsite firefighting equipment;

(b) Readily available wrenches or keys to open the valves; and

(c) Readily available adapters capable of connecting hydrant fittings to the hose equipment of any firefighting organization relied upon by the mine.