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50 FR 4082, Jan. 29, 1985, unless otherwise noted.
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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.