Abstract: A quick-connect fitting for transferring gaseous and/or liquid media, in particular for filling gas cylinders, has a housing (11) with an inlet (12), and outlet (13) for the medium to be transferred and a quick-connect device arranged in the area of the outlet (13) with clamping tongs (15, 15') that can be interlocked with an external complementary gripping profile, a hollow sealing piston (16, 16') that can glide in the housing (11) and an actuating device (17) for applying the clamping tongs (15, 15') which is linked to the sealing piston (16, 16') in a relatively movable manner by means of a sliding sleeve (18, 18').At least one bolt (20) is provided for linking the sliding sleeve (18, 18') to the sealing piston (16, 16') and the actuating device has an elongated member (17) mounted on the housing (11) with a disk cam (36) that engages the sliding sleeve (18, 18') to make it move.