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See Chinese contents: GB/T 13881-2019 GB/T 13881-2019: Road vehicles -- Pneumatic braking connections between towing vehicles and trailers
This Standard stipulates the type, interchangeability dimensions, performance requirements, test methods, installation, usage and marking of pneumatic braking connections between towing vehicles and trailers. This Standard is applicable to pneumatic braking connectors adopted in doublepipeline pneumatic braking system equipped in automobiles and trains. Specifically speaking, one of the pipelines is power supply pipeline, and the other is control pipeline.
