Abstract: The present invention relates to a dispensing apparatus for use in dispensing fluid products in an aerosol form. The invention provides a pump (2) mounted on a container for storage of the product. The pump comprises a pump body (3) defining a metering chamber (7), an inlet (25) within the container and a stem (4) for discharging product from the metering chamber and recharging it. Ventilating structures are provided communicating between an exterior of the apparatus and an interior of the container. The ventilating structures comprising a filter (40) through which ambient air passes, wherein the filter is annular and comprises an axially extending sleeve portion (41) conformal with an internal surface of the pump body.