These requirements cover adapters@ couplings and fittings intended for use with natural gas@ manufactured gas@ liquefied petroleum gas (LP-Gas)@ and mixtures thereof@ or anhydrous ammonia for making connections in domestic@ commercial@ or industrial types of systems. Devices that have been identified are as follows: a) Adapters and fittings@ which include those that convert one connection to another; b) Excess flow and check valve adapters and fittings; c) Filling adapters; d) Gauge adapter and fittings; e) Quick-Connect Couplings (other than for low pressure couplings in accordance with the Standard for Quick Disconnect Devices for Use with Gas Fuel Appliances@ CSA/ANSI Z21.41; f) Sight flow indicators; g) Breakaway couplings; h) Thermal shutoff adapters and fittings; and i) Unloading adapters. Devices covered by these requirements are intended for use in systems and facilities covered in one of the following: a) National Fuel Gas Code@ NFPA 54; b) Liquefied Petroleum Gas Code@ NFPA 58; c) American National Standard Safety Requirements for the Storage and Handling of Anhydrous Ammonia@ ANSI/CGA G-2.1 (ANSI K61.1); or d) Standard on Recreational Vehicles@ NFPA 1192. Adapters@ couplings and fittings for LP-Gas engine fuel service are covered by the Outline of Investigation for LP-Gas and Natural Gas Devices for Engine Fuel Systems@ Subject 1337. These requirements do not apply to adapters@ couplings or fittings for anhydrous ammonia for use on containers or in systems for the following: a) Refrigerated storage systems@ b) Ammonia manufacturing plants@ c) Refrigeration plants where ammonia is used solely as a refrigerant@ and d) Ammonia transportation pipelines.