Abstract: A head for a beverage mixing and dispensing machine comprises a block having bores that define a water inlet connectable with a source of pressurized water, a concentrate inlet connectable with a substantially unpressurized concentrate source, and a venturi aspirator. Mixed water and concentrate flow from the aspirator to a holding chamber in the block that opens downwardly to an outlet spout. A recirculation passage in the block brings mixed liquid back to the aspirator from the holding chamber. Proportioning of concentrate to water is adjusted by a needle valve controlling communication between the holding chamber and the recirculation passage. The head block is readily removably locked to a cabinet that accommodates ducts and control mechanism.