ISO 6455:1983

Unplasticized polyvinyl chloride (PVC) fittings with elastic sealing ring type joints for pipes under pressure — Dimensions of laying lengths — Metric series

Specifies the series of diameters to be used and the dimensions, which are common to those types of fittings regardless their method of manufacture and composition. The current types and sizes of fittings are listed and should be used as a guide.