The invention relates to a new apparatus for delivering liquid to a plurality of containers and removing contents therefrom comprising a plurality of pairs of tubes each tube having or being connected to a constrictible tube portion. A first tube of each pair is adapted to deliver liquid to a respective container from a liquid supply and the second tube of each pair is adapted for connection between suction means and a tube portion adapted to project into a respective container to remove liquid therefrom. Tube constricting means are provided and arranged to constrict said tube portions alternately whereby respectively liquid is delivered to each container and contents removed therefrom.
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