ISO 4435:2003规定了非增塑聚氯乙烯（PVC-U）管道、配件和管道系统的要求，这些管道、配件和管道系统用于无压地下排水和污水处理，用于输送土壤和生活和工业废水以及地表水。 它包括埋地管道工程，但不适用于埋在建筑结构内的管道系统。 适用于带或不带整体插座的PVC-U管。

ISO 4435:2003 specifies the requirements for unplasticized poly(vinyl chloride) (PVC-U) pipes, fittings and piping systems intended for use for non-pressure underground drainage and sewerage for the conveyance of soil and waste discharge of domestic and industrial origin, as well as surface water. It covers buried pipework but does not apply to piping systems buried within the building structure. It is applicable to PVC-U pipes with or without an integral socket.