Drained fluid evacuation stub for a propulsion assembly

A stub for a propulsion unit, the stub configured for discharging drained fluids, said stub comprising a storage cavity for storing the drained fluids and at least one discharge orifice for discharging the drained fluids contained in the storage cavity, wherein the stub comprises elements for measuring a difference in pressure outside the stub and a member for draining the storage cavity, the member being able to move between a first position for closing the at least one discharge orifice and a second position for opening the at least one discharge orifice, the member being configured so as to move from the first to the second position when said difference in pressure is greater than, or equal to, a predetermined value;

• wherein the elements for measuring the difference in pressure outside the stub comprises a first orifice and a second orifice provided on an external surface of the stub.