Hydraulic coupling device

A hydraulic coupling device for connection to a multi-line hose having a plurality of hydraulic conduits bunched together, the coupling device comprising a casing for housing a plurality of plug pins and a retaining disc, the plug pins each being connectible to a respective conduit of the multi-line hose, each of the plug pins having a circumferential external groove, the retaining disc having a plurality of radial retaining slots for receiving said plug pins, each of said retaining slots having a first portion whose width is greater than the maximum external diameter of the associated plug pin, and a second portion whose width is less than that of the maximum external diameter of the associated plug pin but which is greater than the diameter of the circumferential groove in that plug pin, and means associated with said casing for removably fixing said retaining disc therein and for radially confining said plug pins at locations at which they are held against axial movement relative to said retaining disc as a consequence of their external grooves being mechanically engaged within the second portions of their respective radial slots in the retaining disc.