A dispensing device for attaching to a container having a valve stem includes: (a) a hollow tube having a flow channel defined by a wall extending between entrance and exit ends with a connector on the entrance end for connecting to the valve stem; (b) a sleeve extending slidably over a portion of the hollow tube, the sleeve extending over, and having an opening proximate to, the hollow tube's exit end; (c) a sealing gasket around the outside of the hollow tube and between the hollow tube and the sleeve that prevents fluid communication past the gasket between the hollow tube and sleeve; (d) a trigger mount rigidly attached to the hollow tube or container; (e) a trigger hingedly connected at a first location to the trigger mount and operatively engaged with the sleeve at a second location; and (f) an elastic element between the trigger and the hollow tube and/or container.