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GB/T 45356-2025_Chinese: Polypropylene(PP) piping systems for non-pressure buried drainage and sewerage (Chinese: 无压埋地排污、排水用聚丙烯（PP）管道系统) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 45356-2025
