DIN smooth tail couplings are manufactured to DIN2817. They have a smooth hose tail and are secured to the hose with a ribbed four bolt, two piece clamp. This prevents damage that a serrated hose tail can do to the liner of the hose. DIN smooth tail couplings are available with BSP male and female threads in sizes ranging from ¾" to 4".
DIN Smooth Tail Coupling - Male BSPP