ISO/FDIS 16486-4

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"ISO/FDIS 16486-4" refers to a "Final Draft International Standard" within the ISO (International Organization for Standardization) framework, specifically focused on "Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Part 4: Valves".