1 Scope

1.1 These requirements cover fittings to be used in tubing carrying:

1. a) Fuel gases such as acetylene, liquefied petroleum gas (LP-gas), manufactured and natural fuel gases, and other liquefied and non-liquefied flammable gases that are stable because of their composition or because of the conditions of storage,

2. b) Gasoline or gasohol formulated in accordance with Standard Specification for Automotive Spark-Ignition Engine Fuel, ASTM D4814,

3. c) Diesel fuel formulated in accordance with Standard Specification for Diesel Fuel Oils, ASTM D975,

4. d) Heating fuel oils formulated in accordance with Standard Specification for Fuel Oils, ASTM D396, and

5. e) Kerosene formulated in accordance with Specification for Kerosine, ASTM D3699.

Summary of Topics

This new Seventh Edition of ANSI/UL 109 dated December 11, 2025 includes the following changes in requirements:

– Revised coverage of refrigerant fittings; 1.1, 1.6, 5.2, 6.3, Table 8.1, and Table 9.1

– Miscellaneous updates throughout standard to align with Style Manual