Abstract: A quick-coupling device for circuits circulating fluids under pressure comprising a socket and a fitting element that can be housed in the socket, the socket including an outer body defining at least part of a first channel and comprising an annular cavity opening on the first channel, a substantially annular constraint element at least partly housed in the annular cavity and movable therein, and including a plurality of constraint sectors made up of circular sectors of the constraint element, moved radially and defining a release position wherein the constraint element is retracted into the groove so as to enable the fitting element moving relative to the socket, and a tightening position at which the constraint element secures the fitting element to the socket, an extractor partly housed in the outer body able to move the constraint element from the tightening position to the release position.