Quick coupling for threaded or shaped terminals, comprising: a substantially tubular body internally delimiting a passage duct for a fluid, wherein said passage duct has a first end configured to connect removably with a terminal and a second end configured to connect with a circuit; wherein the substantially tubular body comprises: a main body; a plurality of jaws arranged at the first end and around a main axis (X-X) of the passage duct, wherein the jaws are axially anchored to the main body, wherein the jaws are movable radially with respect to the main body between a first release position from the terminal, wherein ends of the jaws are radially spaced from the terminal, and a second position coupled to the terminal, wherein said ends of the jaws are integrally connected to the terminal; activation devices operatively engaged with said jaws to cause the passage between the first position and the second position; an obturator substantially tubular and coaxial to the main body, wherein the obturator is movable axially with respect to the main body, wherein said obturator has a head end intended to come into contact and to make seal with the terminal; wherein the obturator delimits with the main body a compensation chamber axially located between said obturator and said main body and in fluid communication with the passage duct characterised in that the compensation chamber is adapted so that the working fluid contained in said compensation chamber pushes the obturator axially away from the ends of the jaws. a substantially tubular body internally delimiting a passage duct for a fluid, wherein said passage duct has a first end configured to connect removably with a terminal and a second end configured to connect with a circuit; wherein the substantially tubular body comprises: a main body; a plurality of jaws arranged at the first end and around a main axis (X-X) of the passage duct, wherein the jaws are axially anchored to the main body, wherein the jaws are movable radially with respect to the main body between a first release position from the terminal, wherein ends of the jaws are radially spaced from the terminal, and a second position coupled to the terminal, wherein said ends of the jaws are integrally connected to the terminal; activation devices operatively engaged with said jaws to cause the passage between the first position and the second position; an obturator substantially tubular and coaxial to the main body, wherein the obturator is movable axially with respect to the main body, wherein said obturator has a head end intended to come into contact and to make seal with the terminal; wherein a main body; a plurality of jaws arranged at the first end and around a main axis (X-X) of the passage duct, wherein the jaws are axially anchored to the main body, wherein the jaws are movable radially with respect to the main body between a first release position from the terminal, wherein ends of the jaws are radially spaced from the terminal, and a second position coupled to the terminal, wherein said ends of the jaws are integrally connected to the terminal; activation devices operatively engaged with said jaws to cause the passage between the first position and the second position; an obturator substantially tubular and coaxial to the main body, wherein the obturator is movable axially with respect to the main body, wherein said obturator has a head end intended to come into contact and to make seal with the terminal; wherein the obturator delimits with the main body a compensation chamber axially located between said obturator and said main body and in fluid communication with the passage duct characterised in that the compensation chamber is adapted so that the working fluid contained in said compensation chamber pushes the obturator axially away from the ends of the jaws.