Formula delivery appliance

A formulation delivery appliance, comprising:

• a first container having a first end fitting defining a first aperture and a first sealing member in sealing engagement with the first end fitting, the first sealing member having a passageway extending therethrough and being in fluid communication with an interior portion of the first container and with the aperture, the first container being configured to contain a volume of a first formulation;
• a first elongate engagement element having a first channel extending therethrough and being configured to be at least partially received by the first aperture of the first container when the first container is mounted to the first engagement element, a first vent aperture being formed in the first engagement element and providing fluid communication between the first channel and an area outside of the first engagement element when the first container is disengaged from the first engagement element, wherein the first vent aperture is sealed and the first channel receives a flow of the first formulation from the first container when the first container is mounted to the first engagement element;
• a pump in fluid communication with the first channel of the first engagement element to withdraw the first formulation from the first fluid container;
• and
• a head in fluid communication with the pump, the head being configured to discharge the first formulation.