A dispensing device for dispensing a powdered product includes a housing having a first end and a second end defining a first outlet; a plunger slidably received in the first end of the housing, the housing and plunger together defining an interior of the dispensing device which is open to atmosphere; a chamber located within the plunger for housing a powdered product; a sheathing member slidably mounted on an end of the plunger proximate the second end of the housing, and having an inlet and a second outlet closed by a frangible membrane. Additionally, the plunger includes a perforating element for puncturing the frangible membrane when the plunger is moved towards the second end of the housing.