Every produced diameter with its catalogue specifications.
Bukan Pipe produces polyethylene pipe in 25 outside diameters, from 16 to 630 mm. Each diameter has its own page giving wall thickness and nominal pressure across every SDR class the catalogue offers at that size.
Diameter alone does not define an order. At any one diameter there are several pressure classes, differing in wall thickness, bore, weight and price. Each size page shows exactly which classes exist at that diameter.