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UL 119 Ed. 4-2016
Outline of Investigation for Adapters, Fittings and Couplings for Anhydrous Ammonia and Fuel Gases
These requirements cover adapters, couplings and ttings intended for use with natural gas, manufactured gas, lique ed petroleum gas (LP-Gas), and mixtures thereof, or anhydrous ammonia for making connections in domestic, commercial, or industrial types of systems.
Underwriters Laboratories [ul]