The DIN 11851 union is widely used throughout Europe and incorporates a round slotted nut and a flush fitting lipped seal, as standard.  The union is manufactured to suit Imperial tube sizes from 1” to 4” and also to suit DIN 11850 metric tube from 10mm to 150mm.  Two seals designs are offered for the fitting, namely the flush fitting and crevice free lipped seal and also the cheaper D section seal.  The standard seal material is Nitrile/Perbunan and is generally blue or grey in colour, while alternatives in Viton, EPDM and translucent silicone are also offered.  The male features an inverted cone face that carries the seal, while the liner is similarly conical in section and

Size Ranges:
Imperial: 1" to 4"
Metric: 10mm to 150mm