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ISO 4132:1979 Unplasticized polyvinyl chloride (PVC) and metal adaptor fittings for pipes under pressure -- Laying lengths and size of threads -- Metric series
standard by International Organization for Standardization, 07/01/1979
Specification of the series of diameters to be used and the dimensions, which are common to all types of PVC- and metal adaptor fittings for pipes under pressure, to achieve connection to existing metal pipes, fittings and valves.
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