Dispensing device suitable for a foamable product

A dispensing device for dispensing a foamable product, the dispensing device comprising:

• a dispensing channel, the dispensing channel comprising:
• a shroud comprising an outlet, wherein the outlet forms a piston chamber;
• a dispensing channel disposed within the shroud, wherein the dispensing channel comprises
• an inlet for communicating with a valve-element of a container containing the foamable product, and
• an exit forming a piston for dispensing the foamable product from a passage within the piston, wherein the piston is received in the piston chamber such that an end face of the piston extends radially outward from the passage in a plane that is perpendicular to the piston passage and the end face contacts an inner surface of the piston chamber;
• a variable-volume cavity defined by the piston and the piston chamber, the piston being,
• separate from and rigidly movable with respect to the piston chamber to vary the volume of the variable-volume cavity between a first configuration and a second configuration, wherein the piston and the piston chamber move with respect to one another to contact such that the first volume of the cavity is substantially zero, and in the second configuration the variable-volume cavity has a second volume greater than the first volume and the outlet is open such that the foamable product can flow through variable-volume cavity to the outlet.