The auxiliary valve is a needle valve that is installed on the tank valve in chlorination systems to protect the pipeline, and the flexible pipe is connected to it. In this way, by closing the auxiliary valve as a means to cut off the flow of chlorine gas or liquid when changing full and empty tanks, it is possible to prevent the entry of air moisture into the pipe and the corrosion caused by it, as well as the possibility of stopping and connecting the flow of chlorine from, Facilitates the capsule.