Originally from Germany, DIN is an acronym for Deutsche Industrial Norm. The DIN union is used to connect or access pumps, machinery and processing lines. DIN fittings are common in European countries and are made to suit DN (Diameter Nominal) tube sizes.
In addition, DIN Inch (also known as DINCH) is a DIN union variation and literally represents DIN fittings that suit imperial or ‘inch’ tube sizes.