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(a)
Liquid level gauging devices. See §173.315(h) of this subchapter.
(b)
Pressure gauges. (1) See §173.315(h) of this subchapter.
(2) Each cargo tank used in carbon dioxide, refrigerated liquid or nitrous oxide, refrigerated liquid service must be provided with a suitable pressure gauge. A shutoff valve must be installed between the pressure gauge and the cargo tank.