Abstract: This invention relates to a closure device for a container containing volatile liquid. The closure device is attachable to the container and includes a valve assembly having an actuating handle, a valve member associated with the actuating handle and a valve outlet. Preferably the valve assembly also includes a valve body which is attachable to a conduit projecting into the container and through which volatile liquid may be drawn upon operation of the valve assembly.The invention also relates to an auxiliary valve for the container which comprises a valve body attachable to the container which includes a valve inlet for entry of fluid into the interior of the container and a relief valve or bypass passage for venting of excess fluid from the container to prevent build up of excess pressure within the interior of the container.The invention also includes within its scope a container containing volatile liquid having the above mentioned closure device and auxiliary valve attached thereto.