Concentrated beverages are supplied from corresponding collapsible bags-in-boxes to a fountain dispenser having multiple dispensing valves and through corresponding beverage supply lines each having an air operated pump. A coupler connects each supply line to a spout on the corresponding beverage bag, and each spout and coupler has a normally closed spring-biased valve. Each beverage supply line is cleaned by a cleaning solution confined within a bag-in-a-box and having a spout connected by another coupler to one end portion of a cleaning solution line having a second end portion with an adapter connected to the coupler on the beverage supply line. A manifold has an inlet connected to the first end portion of the cleaning solution line and multiple outlets with shut-off valves connected to second end portions of corresponding cleaning solution lines so that multiple beverage supply lines to a dispenser may be cleaned simultaneously.
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