Abstract: A tubular quick coupling comprises a first tubular element with a hollow connector body defining an axial orifice that is to receive a second tubular element provided with a circular rib, a latch blocked axially in the first tubular element and radially actuatable to release the second tubular element from the first tubular element, and a security system that prevents the second tubular element being withdrawn. The security system is a flexible and breakable ring that has a perimeter portion inside the first tubular element between the inlet of the orifice of the body and the latch in order to block the second tubular element coaxially in the first tubular element in spite of actuating the latch, and the ring has at least one perimeter portion in the form of a breakable loop that projects outside the body.