Abstract: The present invention relates to a transfer tank security system for liquids such as beverage syrups which discourages the unauthorized filling of the transfer tank through either the pressurized gas inlet and/or the liquid outlet. This is accomplished by providing a flow restrictor in line with the pressurized gas inlet and/or the liquid outlet, which flow restrictor severely limits the rate at which a liquid can be introduced into the transfer tank through either the pressurized gas inlet and/or the liquid outlet.