Abstract: An adapter (9) for connecting a removable liquid container (10) to a liquid dispenser (1), said adapter having at a first end thereof a liquid container connector and at a second end thereof a dispenser connector, said liquid container connector having a probe part (12) adapted to pierce an outlet comprising a self-sealing valve or membrane of said removable liquid container (10), said probe part (12) being hollow and having at least one inlet for liquid from said removable liquid container, said dispenser connector being hollow and having at its end remote from said probe part an outlet for liquid from said removable liquid container, wherein the outlet of the dispenser connector is adapted to fit tightly around an existing feed tube of the liquid dispenser (1). The adapter (9) can be part of an adapter assembly, which can optionally comprise a liquid transfer regulating means (11) adapted to cooperate with and regulate liquid transfer through said adapter (9).