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§ 57.13021 High-pressure hose connections.
Except where automatic shutoff valves are used, safety chains or other suitable locking devices shall be used at connections to machines of high-pressure hose lines of
3/4-inch inside diameter or larger, and between high-pressure hose lines of
3/4-inch inside diameter or larger, where a connection failure would create a hazard.
This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.