Abstract: Disclosed is apparatus for dispensing a fluid from a container by introducing the fluid at a relatively low flow rate into a primary fluid flow conducted by an adjacent conduit. In the embodiment shown, a housing equipped with multiple chambers for holding different fluids may be manipulated relative to the conduit for selectively communicating fluid from one of the chambers along a passage leading to the primary flow. The conduit is shaped to reduce the cross-sectional area of the primary flow at the point of intersection with the passage. Atmospheric pressure propels the fluid from the selected chamber along the passage and into the primary fluid flow.