Abstract: The invention relates to a system for transferring a liquid consumable product, such as milk, from a bulk storage tank to a transport vehicle receiving tank or from one bulk tank to another whether stationary or mobile. The system increases the efficiency with which the milk is transferred from the bulk tank to the transport vehicle by providing a centrifugal pump permanently positioned on the milk producer's premises proximal the bulk tank. The system includes an air-purge system for removing any residual milk from the pump and transfer lines once pumping has ceased, as well as a wash system for cleaning the pump system components after use. In addition to transferring milk from the bulk tank to the transport truck, the centrifugal pump is conveniently adaptable for use in the washing operations, thereby adding to the efficiency of the overall system.