Another name is emergency shut-off valve.It can replace traditional top refueling instead of bottom refueling.Enable people work easily, time saved and environment friendly as well.It has a shut-off slot to its design and the shut-off slot will break off while suffering an accident.In a condition as not bring any impact to tank hermetic status, it will cut off the pipeline from the tank and effectively avoid any oil leakage of the tank.Ensure the safety of the tank.