UL Subject 147A
Standard for Nonrefillable (Disposable) Type Fuel Gas Cylinder Assemblies (Bulletin, 7/16/1999)
standard by Underwriters Laboratories, 07/16/1999
UL Subject 971
Standard for Nonmetallic Underground Piping for Flammable Liquids (Bulletin, 4/21/2000)
standard by Underwriters Laboratories, 04/21/2000