A system for the fast connection of a pipe to an outlet and the automatic closing of the outlet in the absence of the pipe includes a bushing (1) externally mounted on the outlet and provided with a slot (1b), a gate (2； 2') mounted on the body in which the outlet is formed and mobile between a position closing said bushing (1) through introduction into the slot (1b) and a position opening the bushing (1), and a terminal (3； 3') mounted at the end of the pipe and provided with a peripheral groove (3a； 3a') suitable to receive the gate (2； 2'), the terminal (3； 3') being sized and shaped for internal or external coupling with the bushing (1).
