Gas cock adapted to a multiple burner comprising a main ring and at least one secondary ring, the cock (1) comprising a body (2) comprising an inlet conduit (3) and outlet conduits (4,5), each of which is suitable for conducting gas to the corresponding ring, a regulating element (40) housed in the body (2) and suitable for regulating the incoming gas flow towards at least one of the outlet conduits (4,5) depending on the angular position thereof, and a knob (6) coupled to the regulating element (40), said knob (6) being rotary between an initial position and a final position. The cock (1) comprises safety means (20) blocking the outlet conduit (5) in a critical turning interval of the knob (6) arranged between the initial turning position and the final turning position.